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ARMY TM 5-6675-308-34

MARINE CORPS TM 08837A-34/2

TECHNICAL MANUAL

DIRECT SUPPORT AND GENERAL SUPPORT

MAINTENANCE MANUAL

FOR

POSITION AND AZIMUTH

DETERMINING SYSTEM AN/USQ-70

PART NO. 880500-1

NSN 6675-01-071-5552

This manual supersedes TM 5-6675-308-34, 15 December 1981.

HEADQUARTERS, DEPARTMENTS OF THE ARMY ANO THE NAVY

24 JULY 1985

Summary of content (404 pages)

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ARMY MARINE TM CORPS 5-6675-308-34 TM 08837A-34/2 TECHNICAL MANUAL DIRECT SUPPORT AND GENERAL MAINTENANCE SUPPORT MANUAL FOR POSITION DETERMINING This manual supersedes AZIMUTH SYSTEM PART NSN AND NO. AN/USQ-70 880500-1 6675-01-071-5552 TM 5-6675-308-34, 15 December 1981.
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TM 5-6675-308-34 TM 08837A-34/2 C7 HEADQUARTERS DEPARTMENT OF THE ARMY AND HEADQUARTERS U.S. MARINE CORPS WASHINGTON, D.C., 30 December 1993 CHANGE No. 7 Direct Support and General Support Maintenance Manual for POSITION AND AZIMUTH DETERMINING SYSTEM AN/USQ-70 PART NO. 880500-1 NSN 6675-01-071-5552 EIC : YOA DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. TM 5-6675-308-34/TM 08837A-34/2, 24 July 1985, is changed as follows: 1. 2.
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TM 5-6675-308-34 TM 08837A-34/2 By Order of the Secretaries of the Army and Navy (Including the Marine Corps): GORDON R. SULLIVAN General, United States Army Chief of Staff Official: MILTON H. HAMILTON Administrative Assistant to the Secretary of the Army 0.5994 DAVID E. BOTTORFF Rear Admiral, CEC, US Navy Commander Navy Facilities Engineering Command D. L.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 TABLE OF CONTENTS (Continued) 4. CHAPTER Section 5. CHAPTER APPENDIX A Page 4-1 4-7 4-8 4-15 4- 1 4-39 4-45 4-131 GENERAL SUPPORT MAINTENANCE INSTRUCTIONS General Tools and equipment Testing and troubleshooting Maintenance of PADS I. II. III. IV. Paragraph MATERIEL USED IN CONJUNCTION WITH MAJOR ITEM 5-1 REFERENCES A-1 GLOSSARY Section I. II. III.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 088374-34/2 Figure 2-1.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 DEATH OR SERIOUS INJURY, as well as damage to the tapes may result if the tapes are allowed to come into contact with 115 VAC. The power supply contains 115 volts ac. DEATH OR SERIOUS INJURY may result from contact with 115 volts ac. Be careful when performing the power supply testing and troubleshooting procedure. I WARNING I The computer power supply contains 115 volts ac. DEATH OR SERIOUS INJURY may result from contact with 115 volts ac.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 TECHNICAL MANUAL No. 5-6675-308-34 (ARMY) No. 08837A-34/2 (MARINE CORPS) DEPARTMENT OF THE ARMY AND HEADQUARTERS U.S. MARINE CORPS WASHINGTON, D. C., 24 July 1985 Direct Support and General Support Maintenance Manual POSITION AND AZIMUTH DETERMINING SYSTEM AN/USQ-70 PART NO. 880500-1 NSN 6675-01-071-5552 (EIC:YOA) REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this manual.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 TABLE OF CONTENTS (Continued) 4. CHAPTER Section 5. CHAPTER APPENDIX A Page 4-1 4-7 4-8 4-15 4- 1 4-39 445 4-131 GENERAL SUPPORT MAINTENANCE INSTRUCTIONS General Tools and equipment Testing and troubleshooting Maintenance of PADS I. II. III. IV. Paragraph MATERIEL USED IN CONJUNCTION WITH MAJOR ITEM 5-1 REFERENCES A-1 GLOSSARY Section I. II. III.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 LIST OF ILLUSTRATIONS Number 1-1. 2-1. 2-2. 3-1. 3-1.1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 3-13. 3-14. 3-15. 3-16. 3-17. 3-18. 3-19. 3-20. 3-21. 3-22. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 4-14. 4-15. 4-16. 4-17. 4-18. 4-19. 4-20. 4-21. 4-22. 4-23. 4-24. Title Auxiliary Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 LIST OF ILLUSTRATIONS (Continued) Title Number 4-25. 4-26. 4-27. 4-28. 4-29. 4-30. 4-31. 4-32. 4-33. 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. FO-1. FO-2. FO-3. FO-4. FO-5. FO-6. iv Contact Pins and Insertion and Removal Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . Contact Pin Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Contact Pin Insertion Tool Loading. . . . . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 LIST OF TABLES Table Title Page 1-1. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-6.1. Auxiliary Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Direct Support Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tools and Materials Required for Direct Support Maintenance . . . . . . . . . . . Direct Support Troubleshooting . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 CHAPTER 1 INTRODUCTION Section I. GENERAL 1-1. Scope. This manual contains information required to maintain, test, troubleshoot, and repair the Position and Azimuth Determining System AN/ USQ-70 (PADS) at the direct support and general support levels. Functional descriptions, block diagrams, tools and material lists are provided to support these functions as dictated by the Maintenance Allocation Chart (Appendix D of TM 5-6675-308-12).
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ARMY TM 5-6675-308-44 MARINE CORPS TM 08837A-34/2 Figure 1-1.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 1-1. Auxiliary Equipment Wt Dimensions mm (in.) NSN Item Qty Inertial Measurement Unit Case CY-7605/USQ-70 1 609.6 (24.0) Computer Case CY-7606/USQ-70 1 Control and Display Unit Case CY-7608/USQ-70 Ht Dp Kg Wd (lbs) 609.6 (24.0) 711.2 (28.0) 34.0 (75.0) 431.8 (17.0) 431.8 (17.0) 3683 (14.5) 13.2 (29.0) 1 317.5 (12.5) 304.8 (12.0) 8.6 292.1 (1 1.5) (19.0) Power Supply Case CY-7607/USQ-70 1 533.4 (21 .0) 533.4 (21.0) 533.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 CHAPTER 2 FUNCTIONING OF EQUIPMENT 2-1. General. This chapter contains functional descriptions for the Position and Azimuth Determining System (PADS) and its major units. Depth of coverage is based on the requirement to support direct and general support maintenance.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 088374-34/2 Figure 2-1.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 reads the keyboard word, the parity status flip-flops are reset. A long loop serial bus self-test function is provided in the CDU by wrapping around bits 8 through 15 of the address word as bits 8 thru 15 of the keyboard word. There is no restriction on the bit patterns used on these bits. (b) The second type of CDU word provides an additional self-test feature for the CDU.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 1. The program counter, one of the RAM registers, is a 16-bit register that holds the next instruction to be accessed into memory. As each instruction is executed, the program counter contents are incremented by one, thus providing the address of the next instruction. The program counter is also used as a reference register for addressing operands into memory. (2) Control section.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 by no. 3 control circuit card assembly, and has priority over normal instruction execution. 1. Memory input. To store information in the memory unit, the request ing device generates a memory initiation request and the memory address input. The initiation request is sent to the CPU where the CPU control logic determines access to the data bus.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 (h) Bus and switch controls. The bus and switch controls provide the switching for the DMA and interrupt control, The output of the bus and switch controls is routed to the output switch for switching onto the SDB. data. The single card assembly memory consists of the following major elements: b. C o r e M e m o r y . The core memory contains the timing and registers required for storing data in the core stack assembly.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 contents of the memory register are then presented to the adder unit input through the B-switch along with no input (zero) from the A-switch. The output of the adder unit, representing the operand is then strobed into the accumulator. For the case where a 32-bit transfer is executed, two 16-bit operands are sequentially strobed into the memory register. Upon completion of two memory cycles, a full 32-bit operand is loaded into the accumulator.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 frames, during three of which no synchro or resolver conversions are made, the entire sequence repeats itself. The A/D converter is contained on the A/D converter circuit card assembly. (8) Platform input/output logic. The platform 1/0 logic accumulates the AV pulses from the platform and generates gyro torquing pulses wx, wY, and wz for the platform. The platform I/O logic is contained on the platform circuit card assembly. (a) V accumulation.
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MARINE TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 2-2.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 switching regulator requires + 15 and — 15V for its operational amplifiers and a 40-kHz square wave signal for its pulse width modulation section. The normal control signal for the + 5V switching regulator is regulator-on.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 ±28V power supply Ambient temperature control DC power supply DC-to-AC sine wave inverter DC-to-AC square wave inverter Power supply monitor and control Battery charger Battery monitor and control a. RFI Filters. Two RFI filters make up this assembly. The first is located at vehicle input power and smooths current transients when input power is switched between vehicle power and PADS.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 CB1 and CB2 are both switched on. Current in SCR is below 05 amps. Vehicle battery voltage is higher than + 24V for M151 or + 25V for OH-58. PADS battery voltage is below + 28V. The charging current is limited to 6.0 amps, maximum. A charging’ signal will light the CDU CHRG display indicator when charging current is equal to, or greater than 2 amps.
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ARMY TM 6-6676-308-34 MARINE CORPS TM 08837A-34/2 CHAPTER 3 DIRECT SUPPORT MAINTENANCE INSTRUCTIONS Section I. GENERAL 3-1. Scope. Direct support maintenance includes repair of the computer and CDU by circuit card replacement, and replacement of computer, computer power supply, IMU, power supply, CDU, and cables. Failed units are forwarded to general support maintenance. 3-2. Test Setup. The primary pallet weight exceeds the normal two-person lift capability.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-1.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 3-3. Turn On/Turn Off To prevent damage, do not move PADS for at least 2 minutes following shutdown. a. Turn on +28V power source. b. Power is applied to PADS by setting PS BATTERY and VEHICLE circuit breakers CB1 and CB2 to ON. Activate the system by pressing CDU ON/OFF. The display cues for spheroid for core memory, or GPS C-E for solid state memory. c. If PADS is on, pressing ON/OFF initiates shutdown.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-1. Direct Support Test Procedure no. Status indicators CDU Data display Step Operator action Reference NOTE This table summarizes PADS operational sequences. More detailed descriptions are in the paragraphs listed in the Reference column. a. CDU pushbuttons are underlined e.g., press STOP. b. A lighted status indicator is shown in Status Indicators column and remains lighted until extinguished. e.g. e. An extinguished status e.g.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-1. Direct Support Test Procedure - Continued Step no. CDU Data display Operator action Status indicators Reference 8. Enter spheroid; PADS cues for easting “E” .0 Para 3-5 9. Enter zone and casting PADS cues for northing “N” .0 Para 3-5 10. Enter northing PADS cues for “EL” .0 Para 3-5 MODE O ENT CAL MON Para 3-5 Z-VEL Note 2 Para 3-6 elevation 11. 12. 13.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 b. Brighten. To brighten the display press LAMP; release for 2 to 6 seconds; press and hold LAMP. All lamps light and the intensity slowly increases. At full brilliance, ALARM DS3 sounds. Release LAMP when desired intensity is reached. The display returns to previous indication at the new intensity. c. Lamps Test. Set display to full brilliance and hold LAMP.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 3. SUV 3 Susv Left side driver sight/plumb bob 4. M151 4 Jeep 5. OH-58 5 PADS mounted OH-58 Helicopter plumb bob arm 6. 6 PADS mounted UH-1 Helicopter plumb bob arm 7. PLMB 7 M151 Jeep PADS mounted plumb bob arm UH-1 Pintle mounted plumb bob e.2 The operator presses CDU ±/2 or -/8 to advance or decrement the vehicle selection until the correct vehicle has been displayed then presses ENT.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-1.1.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 .0, means PADS f. A display showing “E” 0: wants the universal transverse mercator (UTM ) zone and casting coordinate entered. Zone is entered first and will eventually appear to the left of the colon. The coordinate must have 7 digits and be entered to the nearest tenth of a meter. Example Enter an casting value of 246789.7 for zone 12. Press - to scan ID’s 50, 49, 48, and 47 to verify the entered values are correct.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 h. It is possible to speed entry of survey data to examine malfunction codes (refer to table 3-4) by entering a one-digit coordinate for each entry (e.g., 0.1 meter). However, an IMU failure will be indicated if alignment is allowed to proceed past MODE 4. 3-6. Alignment. PADS starts to align itself at tumon and automatically continues alignment after the survey data is entered (paragraph 3-5). Alignment takes 30 to 40 minutes.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 ‘ Figure 3-2.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3 - 2 . Tools and Materials Required for Direct Suppoti Maintenance Item Adhesive, silicone, room temperature curing Adhesive, silicone RTV, non-corrosive Alcohol, isopropyl IT-I-735 Battery Box CY-7560 USQ 70 Cable, power, W211 Carrier, battery Cloth, lint free Purpose NSN or specification Used to bond IMU cover, computer cover, and computer/computer power supply R.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-2.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-2. Tmls and Matarials Raquired for Direct Support Maintananca – Continuad Purpose Item NSN or specification Screwdriver, cross-tip, no.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Section III. TROUBLESHOOTING 3-9. Troubleshooting. Troubleshooting actions for a series of malfunctions are listed in table 3-3. The probable causes of a malfunction are listed in order of most likely occurrence or most logical troubleshooting procedure. Troubleshooting steps should be performed in the order given. a. Software built-in-test features provide additional diagnostic capability when the CDU and computer are operating at least partially.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-3. Direct Support Troubleshooting Probable cause Malfunction Troubleshooting/corrective action NOTE Fault indicators are normally black. Before applying power, inspect CDU, computer, and PS for set (white) fault indicators and record for troubleshooting. Change fault indicators from white to black by pressing LAMP after power has been applied. If a malfunction occurs, recycle power and restart the test to verify.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-3. Direct Support Troubleshooting - Continued Probable cause Malfunction 4. PS fan does not operate continuously a. Troubleshooting/corrective action Defective fan Fan voltage is 115 VAC which can be lethal. Use extreme care in measuring it. a. Disconnect PS fan b. Measure voltage between pins A and B and A and C of connector J6 c. b. Defective PS 5. Both IMU and computer fan do not operate (at temperatures above 20°C (73°F)) a.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-3. Direct Support Troubleshooting-Continued Probable cause Malfunction Troubleshooting/correc tive action c. If both voltages are between 105 and 125 VAC, replace fan. Refer to TM 5-6675-308-12 and/or TM 08837A-12/l b. Defective cable W5 See step 5b above c. See step 5C above Defective PS 7. PADS shuts down with PS FAIL fault indicator DS2 white Defective PS Replace PS. Refer to para 3-13d 8.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-3. Direct Support Troubleshooting - Continued Malfunction 10. Not all CDU lamps light on lamp test Probable cause Troubleshooting/corrective action a. Burned out bulbs Replace bulbs. Refer to TM 5-6675-30812 and/or TM 08837A-12/1 b. Defective CDU a. Reverse CDU display register cards A1 and A2. Refer to para 3-17a b. If different lamps remain dark on lamp test, replace defective card by substitution c. Replace A3 card d. Replace CDU.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-3. Direct Support Troubleshooting – Continued Troubleshooting/corrective action Probable cause Malfunction 17. PS BATT ‘FAIL fault indicator DS 1 shows white a. Batteries are low, have failed, are disconnected, or fuse in cableW11 is open a. Check connections to cable assemblies W6and Wll b. Replace cable WI 1 if fuse is open. Refer to TM 5-6675-308-12 and/or TM 08837A-12/l c. Check that PS VEHICLE circuit breaker CB2 is ON d.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-4. Troubleshooting with Bit Malfunction Words – Continued Digit Value e. Malfunction Probable cause/troubleshooting Reference If a malfunction indicator lights again, record which one lights and record the nonzero contents of monitor ID 1 or 2. f. If the malfunction does not clear, turn system off and realign. g. If the malfunction does not repeat, continue with the test. h.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Section IV. MAINTENANCE OF PADS 3-10. General. Direct support maintenance of PADS includes replacement of the IMU, CDU, computer, computer power supply, and power supply, and repairs to those units as well as the mounting base subassembly, battery box, installation kit, transit case, and winterization kit. a. Torquing is required to ensure proper sealing of the computer, CDU and power supply, and mounting of the IMU.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 44-902-34 Figure 3-3. Torque Wrench Set (a) Disconnect cable assembly W 1 conector W1P1 from CDU (4) connector 4J1. (b) Release clamping catches securing CDU (4) to computer (5) if CDU is being stored on top of computer. If CDU is mounted on utility truck dashboard, release clamping catches securing CDU to CDU bracket. (2) Replacement. (a) Secure CDU (4) to top of computer (5) or to CDU bracket on utility truck dashboard.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-5.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-5. IMU Installed in Transit Case (Sheet 2 of 2) c. IMU. Remove and replace IMU (9, figure 3-6) as follows: IMU mounting bolt heads are secured to the bolts by shear pins to prevent overtightening. Use torque wrench to torque the bolts to prevent breakage. If a cap is broken off, unscrew the bolt with a flattip screw driver. NOTE ■ Memory unit Al (7 or 7.1.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-6.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 3-6 1. Power supply 2. Captive screw 3. Captive screw 4. CDU 5. Computer 6. Computer power supply 7. Plumb bob arm (f) Swing plumb bob arm (7) up to stowed position. (g) See figure 3-1 and connect cables to IMU as 1. Connect cable assembly W3 connector W2P1 to IMU connector 2J1. 2. Connect cable assembly W4 connector W4P1 to IMU connector 2J3. 8. IMU mount 9. IMU 10. Bolt assembly 11. Guide pin 12. Computer mounting base 13.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 NOTE d. e. f. g. Use silicone adhesive (RTV 156 or 30079) on IMU cover, computer cover, computer/computer power supply, computer power supply end plate, and power supply bottom cover and side cover gaskets. Use silicone adhesive (MIL-A-46146, Type I) on circuit breaker covers and porro prism cover gaskets. Apply a thin, even coat of silicone to mounting surface. Install gasket on mounting surface. Align holes.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-7.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 3-7 1. 2. 3. 4. 5. 6. 7. 7.1 8. 9. 10. 11. 12. 13. 14. 15. Washer Screw Computer cover CDU Mount bracket Catch strike Screw Solid state memory unit Al Core memory unit Al Screw Wedgelock Computer subassembly Washer Screw Air deflector Screw Washer 16. Guide pin 17. Captive screw assembly 18. Computer power supply 19. RFI gasket 20. A/D converter circuit card assembly Al1 21. I/O discrete circuit card assembly A9 22.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 3-5. Computer Circuit Card Assembly Identification Figure 3-7 card i&iex no. Pati no. 20 880788-3 (preferred) 880788-1, 88:;:;;jmd Cards nomenclature and reference designator Part no.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Just before the connectors mate, check that the memory unit is free in its guides and its top edge is parallel to the computer top surface. 3. Seat the memory unit by applying moderate, even pressure at both sides. The top should be flush with the computer top surface. If excessive insertion force is required or the memory unit extends above the computer, pull the memory out and inspect for bent or broken connector pins. 2.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 (b) Apply sealing compound primer (MILS-22473) to male threads of retainer nut. (c) After primer has dried, apply sealing compound (MIL-S-22473, Grade C) to male threads of retainer nut. Sealing compound shall cover the full engaging length of one of the mating components; assemble parts. 3-17. CDU Maintenance. CDU repair consists of removal and replacement of circuit card assemblies. Figure 3-9 is an exploded view of the CDU. a.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-9.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 3-9 5. 6. 7. 8. 1. Screw 2. Washer 3. Control and display panel 4. Display logic circuit card assembly A1 Display logic circuit card assembly A2 Keyboard and control circuit card assembly A3 Control and display unit cover Gasket Table 3-6. CDU Circuit Card Assembly Identification Card nomenclature and reference designator Figure 3-9 index no. Card part no.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-10.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 (c) Remove capacitors C3 and C4 (5 and 6) from thermostatic switch (4). (2) Replacement. Isopropyl alcohol is flammable and gives off harmful vapors. Use only in well-ventilated area away from open flames and sparks. Avoid prolonged or repeated inhalation of vapors. (a) Release two clamping catches (18) and remove porro prism cover (15) from IMU. (b) Remove two screws (16) and washers (17) securing clamping catch (18) to porro prism cover (15).
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 1. THIS STEP REQUIREDONLYWHEN REPLACING AN INSERT THE FIRST TIME. ENLARGE HOLE IN SUBFLOOR PLATE WlTH 9/16 IN. DRILL BIT. BE CAREFUL TO DRILLJUSTTHRU SUBFLOOR PLATEANDMINIMIZE REMOVALOF MATERIAL FROM BLOCK. 2. DRILL INSERT WITH 11/32 IN. BIT TO A DEPTH OF 3/16 IN. TO EXPOSE KEES. 3. DEFLECT KEES INWARD AND BREAK OFF. 4. REMOVE THREADED INSERT WITH SCREW EXTRACTOR. 5. SLIDE INSERT ONTO INSERTION TOOL AND 6. INVERT TOOL OVER KEES.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-12.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-12.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 1. Mounting base frame 2. Stop 3. Washer 4. Jumper 5. Mounting plate 6. Spacer 7. Upper vibration mount 8. Screw 9. Washer 10. Washer 11. Lockwasher 12. Screw 13. Orifice 14. Support strip 15. Screw 15.1 Washer 16. Screw 16.1 Washer 17. Support strip Legend for Figure 3-12 18. Screw 19. Lockwasher 20. Washer 21. Retainer 22. Orifice 23. Screw 24. Lockwasher 25. Washer 26. Lower vibration mount 27. Washer 28. Screw 29. Spacer 30. Jumper 31. Washer 32.
PAGE 90
ARMY TM 5-6675-306-34 MARINE CORPS TM 08837A-34/2 c. Retainer. Remove and replace retainer (21, figure 3-12, sheet 1) as follows: (1) Removal. Remove four screws (18), four lockwashers (19), and four washers (20) securing retainer (21); remove retainer. (2) Replacement. (a) Place retainer (21) in position on mounting base frame (l). (b) Install four screws (18), lockwashers (19), and washers (20) securing retainer to mounting base frame. d. Plumb Bob Assembly.
PAGE 91
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-13.
PAGE 92
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 a. Removal. Remove rivets securing part by drilling or other suitable means; remove part. b. Replacement. (1) Secure part in position with rivets. (2) Swage rivets in place. 3-22. PADS Transit Case Maintenance. Maintenance of the PADS transit case consists of replacing the shock and vibration isolator mounts (8, figure 3-14). a. Removal. (1) Release latches and remove cover (l).
PAGE 93
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-15.
PAGE 94
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-16.
PAGE 95
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 1/16-lNCH SPACE BETWEEN BOTTOM OF GUTTER AND TOP OF PLATE ROTATED VIEW Figure 3-16.
PAGE 96
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-16.
PAGE 97
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-16.
PAGE 98
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program - Continued Test procedure 2b. Press EXECUTE switchindicator to on Normal indication EXECUTE switch-indicator lights Malfunction indication/corrective action EXECUTE switch-indicator flashes. Replace cards in sequence given: TTY prints out: PADS SOLID STATE DIAGNOSTIC ALIGNMENT PROGRAM Control no.
PAGE 99
PAGE 100
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program - Continued Test procedure Normal indication Malfunction indication/corrective action NOTE Press MEMORY LOAD switch-indicator off and back on if a stop code is reached prior to tape data beii loaded 2g. Press MEMORY LOAD switchindicator to off MEMORY LOAD switch-indicator goes off 2h. Press VERIFY switch-indicator to on to check next tape section against memory contents.
PAGE 101
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program — Continued Test procedure Normal indication Malfunction indication/ corrective action Press verify switch-indicator to off. Press PADS ON/OFF and ENTER switch-indicators to turn computer off. Check tape reader and tape for dirt. Clean as required.
PAGE 102
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-16.
PAGE 103
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-16.
PAGE 104
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-16.
PAGE 105
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-16. Utility Truck Winterization Kit Installation Diagram (Sheet 9 of 9) centerline of the six screw holes (four 5/18inch diameter holes and two 1/4-inch diameter holes) are aligned within 0.900 to 0.960 inch from outboard edge of rear panel. Locate top edge of side mounting plate 1/16 inch below top edge of rear panel. (2) Using side mounting plate as a template, center punch the screw hole locations in rear panel, Remove side mounting plate.
PAGE 106
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for figure 3-16, sheet 6 Item No. 1. 2. 3. 4. 5. 6. Description Nut Washer Spring Door frame Screw 8-32 x 3/4-inch Porro prism door Part No. MS21083C08 MS15795-807 880520-98 80522-1 MS51957-47 880521-1 Legend for figure 3-16, sheet 7 Item No. 1. 2. 3. 4. 5. 6. 7. 8. 9. Description Locknut 1 /2-20 Plunger ball Handle Nylon washer 1/2-inch Door Washer 1/2-inch Spring washer Jam nut 1 /2-20 Pawl Part No.
PAGE 107
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 right side mounting plates. Hold 1 1/4-inch lip flat against rear panel. (2) CenterPunch the eight screw hole locations in the middle of the slots in the rear panel. (3) Drill the eight 5/16-inch screw holes in rear panel, (4) Place angle bracket against rear panel and align screw holes, (5) Secure angle bracket to rear panel usin eight 1/4-28 X 3/4-inch screws (5), washers (3), and locknuts (l). f.
PAGE 108
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 frame so that the same amount of frame (approximately 0.5-inch) is viable on both left and right side of cutout. (3) Using door frame as template, locate and centerpunch the ten side die and bottom screw holes. Remove the six 8-32 screws, washers, and nuts; remove door frame. (4) Drill the ten 3/16-inch screw holes. o. Install Door Frame 880522-1 (4, figure 3-16, sheet 6).
PAGE 109
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34-2 (1) Remove the five cap screws and washers securing angle bracket to vehicle gutter. Retain for future use. (2) Remove the screws and washers securing side mounting and bottom plates to vehicle body: remove rear panel. Retain the screws for future use. 3-25. Modification of OH-58C Helicopter Pallet. The OH-58C helicopter pallet must be modified before the PADS can be installed in the helicopter.
PAGE 110
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 I Figure 3-17.
PAGE 111
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34-2 Figure 3-18.
PAGE 112
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-19.
PAGE 113
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34-2 Figure 3-20.
PAGE 114
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 3-22.
PAGE 115
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34-2 Section V. DIRECT SUPPORT TESTING PROCEDURES 3-30. General. Direct support testing procedures are given in table 3-1. 3-31. Performance Standards. To be returned to service, a PADS must: d. Have no corrosion inside any units which were opened. c. Have no defective gaskets in any units which were opened. a. Be complete. b. Pass the test of table 3-1 with no malfunction. c.
PAGE 116
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 CHAPTER 4 GENERAL SUPPORT MAINTENANCE INSTRUCTIONS Section 1. GENERAL 4-1. Scope. This section describes bench testing of the computer, computer power supply, CDU, and power supply. 4-2. Computer Bench Testing. Bench testing of the computer consists of performing continuity checks when broken or shorted wires are suspected of causing a failure during performance of the self-test procedure. A computer wire list (table 4-1) is provided for bench testing.
PAGE 117
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1 IMU Testing, Alignment, and Troubleshooting Using Tape Reader, Part No. 877406-2 – Continued Test procedure Normal indication SELECT TEST MODE Checksums are equal 2b. Compare printed checksum written on the front of the punched tape in use 2c. Type IMU to select IMU auto- TTY prints out: matic alignment and test se- IMU quence SER NO XXXX DATE XXXX CHECKSUM XXXXXX MOVE IMU TO APPROX 45 DEC HEADING WHEN DONE TYPE: RDY Data matches 2d.
PAGE 118
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1. Computer Wire List — —.
PAGE 119
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1. Computer W i r e L i s t - C o n t i n u e d .
PAGE 120
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1.
PAGE 121
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1. Computer Wire List - Continued — omponent — VVG ype To From Signal — Pin ?ef omponent lef ;olor XYGYFSTSL XYGYFSTSL* ZGYRFTSLW” 2.4 KHZ PDVY MDVX* SPARE2* PDVX SPARE1” PDVZ” DWX DWY * DWZ DWZ” AC LCRSHTON UPGYRTEMP LWGYRTEMP PGND PGND XQUANTDC YQUANTDC ZQUANTDC PGND PGND HDGX32S7 HDGX1S3 ROLLX8S7 ROLLX8S8 SPARE3* ZGYRFSTSLW 2.
PAGE 122
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1.
PAGE 123
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1.
PAGE 124
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1. Computer Wire List - Continued 1 1 To From — 7 )mponent Signal Pin lef Dmponent PGND PGND ADR/DTA* PGND PGND PGND VLAMP AD R/DTA AD DRENV* P+O05V PGND PGND VLAMPRET ~f,JT.
PAGE 125
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1.
PAGE 126
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1.
PAGE 127
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1. Computer Wire List - Continued — :omponent Pin I XYSW* DAB04 DAB04 DAB04 ADDSTROBE2 IDAB07 M-5VA DABOO OABOO XDR* DAB14 DAB14 DAB14 YSR* DAB02 DAB02 DAB02 BIN1 DAB12 DAB12 DAB12 VREFINHIB DAB15 DAB15 DAB15 DAB15 VRFINHBRTN DAB09 IADDSTR2* DAB1O DAB1O DAB1O XYDW* DAB08 DAB08 DAB08 NCS* 4-12 XAOIAl XAOIAl XAOIA1. XAOIAl XAOIA1. XAOIAl XAOIA1. XAOIAl XAOIA1. XAOIAl XAOIA1.
PAGE 128
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1. Computer Wire List - Continued To From — — Signal DAB1l DAB1l DAB1l YDR” PGND PGND PGND PSF OPT 00 STREN” PGND PGND P015VMEMRT P+015VMEM P+015VMEM P-015VMEM P-015VMEM P-015VMEM 9.(J15VMEM >-15VRTN ).15VRTN 3-15VRTN 1.15VRTN 3+ O05V 3+ O05V J+O05V PGND PGND PGND DAB1l DAB1l DAB1l PGND DAB08 DAB08 DAB08 PGND PGND PGND DAB13 DAB13 DAB13 PGND ‘GND IAB12 IAB12 IAB12 PGND PGND DAB02 DAB02 DA F4117 Componenl XAOIA1. XAOIAl XAOIA1.
PAGE 129
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1. Computer Wire List - Continued — To From — :omponent Signal Pin Pin lef Ref ,WG ype Color Group Remarks Route PGND PGND PGND PGND PGND DAB07 DAB07 r DAB07 PGND PGND DAB03 DAB03 DAB03 PGND PGND DAB04 DAB04 DAB04 PGND PGND DAB06 DAB06 DAB06 PGND PGND DAB05 DAB05 DAB05 PGND PGND DABO1 DABO1 DABO1 PGND PGND PGND P+O05V P+O05V P+O05V PO15VMEMRT P015VMEMRT P015VMEMRT P015VMEMRT P+015VMEM P+015VMEM P+015VMEM P+015VMEM P+015VMEM P.
PAGE 130
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1. Computer Wire List - Continued To From — — Signal Component Pin Poses AODSTROBE1 Poses PGND PGND PGND PGND P+O05V P+O05V P015VMEMRT P015VMEMRT P015VMEMRT P015VMEMRT P015VMEMRT P015VMEMRT P+015VMEM P+015VMEM P+015VMEM P+015VMEM P+015VMEM PFA* CYCLEINIT (RE/lN)*CP MEMENABLE* MEMBUSY PGNO DABO1 OABO1 DABO1 DAB05 DAB04 OAB04 DAB03 DAB03 Ref :omponen Pin Ref 4W( rype Color XA01A2 XA01A2. xAol A2XA01A2.
PAGE 131
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1.
PAGE 132
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-1. Computer Wire List - Continued To From Signal LAMP LAMP +O05V ‘+O05V GND GND GND GND SPOR 6VAC90 6VAC90RTN PUFLGSET* .
PAGE 133
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-1.
PAGE 134
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2. CDU Wire List — — —.
PAGE 135
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2. CDU Wire List - Continued From Signal IM!J* ND1l B RELAY* RELAY” DP1l ND09B ND07B ND07D DP08 DP08 DP06 ADL ADM ADP ND02F VLAMP VLAMP VLAMP VLAMP Z-VEL ENT ND1lB ND1lA ND1lD DP1l DP1O DP08 ND08E NEJ07D DP15 DP13 tiD07G RTTN VD05G ‘iDo5B ID04D !D04C )P05 W04F ID04A IDK IDJ AD 1 ADP ADP ND02C ND02G VLAMP VLAMP VLAMP CHARGE* CHARGE* DPUFAIL* ND1lE ADZ ND09B DP15 DP14 ND08F ND07B ND08E DP07 ND07E ND05A ND05C ‘4D05D.
PAGE 136
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2.
PAGE 137
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2. CDU Wire List - Continued — To From — Signal V1 AMP VLAMP RS2321NR FIAGRST* SBPOR* VLAMPRET VLAMPRET VLAMPRET VLAMPRET VIAMPRET BATTERY” 250KHZ* SBPOR SHLDRET SHLDRET gli;i;;” 115VAC 115VAC .
PAGE 138
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2.
PAGE 139
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2.
PAGE 140
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2.
PAGE 141
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2. CDU Wire List - Continued From Signal MARK MARK MARK MARK CAL CAL CAL CAL CAL MARK MARK MARK VLAMP ~L~M![ Z:VEL ENT ENT ENT ENT Z-VEL Z-VEL Z-VE1 Z-VEL Z-VEL ENT ENT ENT VL AMP VL AMP NDOID NDOIC NDOIB NDOIA NDOIF NDOIE NDOIG DPO1 VLAMP V L AMP ND02D ND02C ND02B ND02A ND02F ND02E ND02G DP02 VL AMP VLAMP ADA ADB ADC ADD ADE ADF ADG ADH AD I ADJ ADK ADL ADM ADN ADO ADP VL AMP 4-26 Component XDS07 . XDS07XDS07XDS07 . XDS07. XDS07.
PAGE 142
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2. CDU Wire List - Continued To From Pin Signal ND04B ND04C ND04D ND04E ND04F ND04G DP03 VLAMP VLAMP ND05A ND05B ND05C ND05D ND05E ND05F ND05G DP05 DP04 VLAMP VLAMP ND06A ND06B ND06C ND06D ND06E ND06F ND06G DP12 DP06 VLAMP VLAMP I DP13 VLAMP VLAMP ND08A ND08B ND08C ND08D ND08E ND08F ND08G DP07 DP14 VLAMP VLAMP ND09A ND09B ND09C ND09D XDSll XDS12XDS12XDS12. XDS12. XDS12XDS12XDS12. XDS12XDS12XDS13. XDS 3.
PAGE 143
ARMY TM 5-6678-308-34 MARINE CORPS TM 08837A-34/2 Table 4-2. CDU Wire List - Continued From Signal ND09E ND09F ~;:;G DP15 VLAMP VL AMP ND1OA ND1OB ND1OC ND1OD ND1OE ND1OF ND1OG DP09 VL AMP VLAMP ND1lA ND1lB ND1lC ND1lD ND1lE ND1lF ND1lG DP1l DP1O VL AMP 4-28 Component XDS18. xDsl8xDs18XDS18. XDS18xDsl8XDS18XDS19xDsl9XDS19XDS19XDS19XDS19. XDS19XDS19xDsl9XDS19. y~.
PAGE 144
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-2.
PAGE 145
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-3. Power S Upply Wire List From Signal Pin A08 A08 A08 A08 A08 A08 A08 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A09 A4 A4 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A5J2 A6A1 A6A1 4-30 . . - To Ref B BS B B B B : B B B BS B B B B B B B BS B : . . .
PAGE 146
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-3. Power SU pply Wire List - Continued To From I Signal SINEOSCON RI NVON/OFF SIGRTN -14V +14V MA INBUS 1 115VSQ 115VSQRTN SHIELD 115VACSINE 115VS1NE 115V SINE 115VSINERN 26VSINERTN 26VACSINE SHIELO +20V -20V MAINBUSRTN MAINBUS 2 115VSQ 115VSQRTN SHIELD SHIELD 115VS1NE 1 115VSINE 2 1115vsINE 3 115VSINERT 115VSRTN 9.lREFRETN 9.lVREF +17V MAINBUS 3 VEH.BATT 2 VEH.
PAGE 147
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-3.
PAGE 148
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-3. Power S U pply Wire List - Continued To From — Signal K2A2 VEH.
PAGE 149
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-3.
PAGE 150
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-4.
PAGE 151
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-4.
PAGE 152
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-4.
PAGE 153
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-4. Power Supply Harness Assembly Wire List - Continued From Signal )FF !4UNREGRTN !4UNREGRTN !4UNREGRTN ,AMP GND !4UNREGRTN 4 - 3 8 Component Pin To Ref Component Pin Ref 3J05 3J05 3J05 .
PAGE 154
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Section Il. TOOLS AND EQUIPMENT 4-7. General. Special test equipment used at the general support level is listed for MAC (TM 5-6675-308-12) and is described in TM 5-6675-238-14 and TM 5-6675-30914. Marine Corps users shall refer to TM 08837A-12/1, TM 08839A-14/1, and TM 08840A-14/1, respectively. For repair parts, refer to TM 5-6675-308-24P. Marine Corps users shall refer to TM 08837A-24P/3.
PAGE 155
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-5.
PAGE 156
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-5. Tools and Materials Required for General Support Maintenance – Continued Item Purpose Extractor, screw no.
PAGE 157
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-5.
PAGE 158
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-5. Tools and Materials Required for General Support Maintenance – Continued Purpose Item NSN or specification Screwdriver, cross-tip, no. 1, 3 -inch Used during various removal and replacement procedures in computer PS and PS 5120-00-240-8716 Screwdriver, cross-tip, no. 1, 8-inch Used in removal and replacement of resistors and thermostat 5120-00-529-3101 Screwdriver, cross-tip, no.
PAGE 159
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-5.
PAGE 160
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Section III. TESTING AND TROUBLESHOOTING 4-8. General. NOTE The computer is the primary tester for the CDU and IMU. Perform the computer test to verify proper computer operation before testing a CDU or IMU. a. General support troubleshooting of the PADS consists of performing testing and troubleshooting of the computer, CDU, PS, and computer power supply as outlined on tables 4-6, or 4-6.
PAGE 161
Figure 4-3.
PAGE 162
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 b. Procedure. Perform computer testing and troubleshooting in accordance with table 4-6 or 4-6.1 and 4-7. The interconnections are shown in figure 4-3. Table 4-8 is a sample printout of the computer test. Table 4-6. Computer Diagnostic/Alignment Program Test procedure Normal indication Malfunction indication/corrective action NOTE This procedure uses tape reader, part no. 877406-1.
PAGE 163
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program -- Continued Test procedure NOTE For computer and CDU testing, use the memory unit from the general support dedicated test computer. If a memory unit failure is suspected from direct support troubleshooting (checksum error, memory test fail, or computer does not operate) use the suspected defective memory unit. For IMU testing, use the memory unit which will be dedicated to that IMU. 1c.
PAGE 164
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program — Continued Normal indication Test procedure W212 TTY W212P1 SPU 20J12 TTY Power 115 VAC W201P1 SPU 20J1 W201P2 115 VAC Malfunction indication/corrective action 1f. Check that W4P1 is not connected to IMU connector 2J3 lg. Set tape reader SPOOLING switch to DISABLE lh. Press SPU ON switch-indicator to on.
PAGE 165
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program - Continued Test procedure Normal indication Malfunction indication/corrective action 1k. Turn on + 28V power source 1l. Set PS BATTERY and VEHICLE circuit breakers CB1 and CB2 to ON 2. CPU TEST NOTE If any card assembly is replaced during this test, repeat the test from step 1h. 2a. Press PADS ON/OFF switch- PADS ON/OFF switch-indicator indicator to on lights.
PAGE 166
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program - Continued Test procedure Normal indication 2b. Press EXECUTE switch-indica- EXECUTE switch-indicator lights tor to on TTY prints out: PADS SOLID STATE DIAGNOSTIC ALIGNMENT PROGRAM PROGRAM CHECKSUM XXXXXX SELECT TEST MODE Malfunction indication/corrective action EXECUTE switch-indicator flashes. Replace cards in sequence given: Control no.
PAGE 167
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program – Continued Test procedure Normal indication Malfunction indication/corrective action Press verify switch-indicator to off. Press PADS ON/OFF and ENTER switch-indicators to turn computer off. Check tape reader and tape for dirt. Clean as required.
PAGE 168
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program – Continued Test procedure 2k. Type TTY character set Normal indication Each character typed is printed Malfunction indication/corrective action Same as step 2j 2l. Press LTRS key 2m.
PAGE 169
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program - Continued Test procedure Normal indication NOTE NOTE Malfunction indication/corrective action Press MEMORY LOAD switch-indi- Ignore PARITY ERROR switch-indicator off and back on if a stop code cator light unless tape stops. is reached prior to tape data being read. 3b. Press MEMORY LOAD switchindicator to off MEMORY LOAD switch-indicator goes off 3c.
PAGE 170
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6. Computer Diagnostic/Alignment Program — Continued Test procedure 3k. Compare printed checksum to checksum written on the front of the PADS diagnostic-alignment tape number 877418-5 Normal indication Checksums are equal Malfunction indication/corrective action Checksum is incorrect: Inspect tape reader photocell assembly and tape for dirt. Clean as required Reload complete diagnostic program If new checksum is correct, continue with test.
PAGE 171
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.1. Computer Diagnostic/Alignment Program Using Tape Reader, Part No. 877406-2 Test procedure Normal indication Malfunction indication/corrective action NOTE The Test Procedure column contains the test operation to be performed. The Normal Indication column contains the desired test set or teletype response to the test operation. The malfunction indication(s) and corrective action(s) are listed in the third column.
PAGE 172
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.1. Computer Diagnostic/Alignment Program Using Tape Reader, Part No. 877406-2 Test procedure Normal indication Malfunction indication/corrective action 1c. Install computer on pallet frame as necessary 1d. Check that + 28V power source and PS BATTERY and VEHICLE circuit breakers CB1 and CB2 are OFF 1e.
PAGE 173
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.1. Computer Diagnostic/Alignment Program Using Tape Reader, Part No. 877406-2 — Continued Test procedure Normal indication Malfunction indication/corrective action 1g. Ensure that tape reader SPL/ LOOP switch is set to LOOP 1h. Press SPU ON switch-indicator to on. Press to extinguish all SPU lighted switch-indicators except SPU ON and PADS OFF SPU ON and PADS OFF switchindicators light. COMP FAIL indicator may light.
PAGE 174
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.1. Computer Diagnostic/Alignment Program Using Tape Reader, Part No. 877406-2 - Continued Test procedure 2a. Press PADS ON/OFF switchindicator to on Normal indication Malfunction indication/corrective action PADS ON/OFF switch-indicator PADS ON/OFF switch-indicator does not light: Computer power lights. PARITY ERROR indicator supply malfunction. Remove and may light troubleshoot in accordance with table 4-20 IMU FAIL indicator lights.
PAGE 175
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 5-3. Horizontal Circle Readings e. Read the horizontal circle. The reading should be 0.150 (within ±0.100 roil), With care, a circle may be set to an accuracy of 0.010 mil. 5-7. Pointing the Theodolite. a. Release the horizontal and vertical clamping screws. b. Aim the telescope on the target. Focus as necessary. c. When the telescope crosshairs are on the target, tighten the horizontal and vertical clamping screws.
PAGE 176
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.1 Computer Diagnostic/Alignment Program Using Tape Reader, Part No. 877406-2—Continued Test procedure Normal indication Malfunction indication/corrective action NOTE The above printout indicates memory type is solid state. Continue with diagnostic program load, step 2K. 2k. Type TTY character set Each character typed is printed Same as step 2j TTY prints out: No printout within 2 seconds or TTY prints out: 2l. Press TTY LTRS key 2m.
PAGE 177
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.1. Computer Diagnostic/Alignment Program Using Tape Reader, Part No. 877406-2 — Continued Test procedure 3a. Press MEMORY LOAD switchindicator to on to load main diagnostic program Normal indication Malfunction indication /correct ive action MEMORY LOAD switch-indicator Tape stops before end of tape: Relights.
PAGE 178
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.1. Computer Diagnostic/Alignment Program Using Tape Reader, Part No. 877406-2 – Continued Test procedure Normal indication SELECT TEST MODE 3k. Compare printed checksum to Checksums are equal checksum written on the front of the PADS diagnostic alignment tape number 877418-5 NOTE You may continue performing the test while the tape is rewinding.
PAGE 179
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.2. Solid State Memory Loading Test procedure Normal indication Malfunction indication/corrective action NOTE This procedure uses tape reader, part no. 877406-1. 1. PRELIMINARY PROCEDURE la. Istall part 1 (of 3) of PADS solid state program tape number 868182-X on tape reader. Do not tape program tape to takeup reel. Manually advance tape beyond readable tape leader lb. Set tape reader SPOOLING switch to ENABLE lc.
PAGE 180
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.2. Solid State Memory Loading- Continued Test procedure Normal indication NOTE Memory clear routing will begin automatically. When completed, TTY will print out LOAD NEXT TAPE SECTION lj. Press EXECUTE switchindicator to off to halt computer 2. SOLID STATE PROGRAM LOAD 2a. Press MEMORY LOAD switchindicator to on to load program EXECUTE switch-indicator goes off MEMORY LOAD switch-indicator lights.
PAGE 181
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.2. Solid State Memory Loading- Continued Test procedure Normal indication 2i. Press MEMORY LOAD switch- MEMORY LOAD switch-indicator goes indicator to off off REVERSE 2j. Press switch– REVERSE switch-indicator lights. Tape indicator to on rewinds and stops at beginning of reel 2k. Press REVERSE switch– REVERSE switch-indicator goes off indicator to off 2l. Set tape reader SPOOLING switch to DISABLE 2m.
PAGE 182
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.3. Solid State Memory LoadingUsing Tape Reader Part No.877406-2 Test procedure Normal indication Malfunction indication/corrective action 1. PRELIMINARY PROCEDURE 1a.
PAGE 183
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.3. Solid State Memory Loading Using Tape Reader Part No. 877408-2- Continued Test procedure Normal indication Malfunction indication/corrective action Control no. 1 circuit card assembly A3 16-bit data circuit card assembly A2 2. No or incorrect printout, replace cards in sequence given 16-bit data circuit card assembly A2 Control no. 2 circuit card assembly A4 Control no. 3 circuit card assembly A5 Control no.
PAGE 184
ARMY TM 6-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.3. Solid State Memory Loading Using Tape Reader, Part No. 877406 -2- Continued Test procedure 2c. Set tape reader FAST/SLOW switch to FAST 2d Press REVERSE switch-indicator to on 2c. Press REVERSE switch-indicator to off NOTE Tape will stop near the beginningof the reel. Repeat steps 2d and 2e until tape stops at end of readable leader. 2f.
PAGE 185
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-7. Test procedure Computer Testing and Troubleshooting Normal indication Malfunctiion indication/corrective action 1. TEST SETUP Check that the diagnostic alignment program is loaded into the computer memory and that the computer is functional in accordance with table 4-6 or 4-6.1 2. COMPUTER DIAGNOSIC NOTE During this test, any failure message listed in table 4-10 maybe printed. Perform corrective actiion specified in table 4-10.
PAGE 186
PAGE 187
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-6.3. Solid State Memory Loading Using Tape Reader, Part No. 877406-2 - Continued Test procedure Normal indication 2r. Press REVERSE switch-indicator to on REVERSE switch-indicator lights. Tape rewinds and stops at beginning of reel REVERSE switch-indicator goes off 2s. Press REVERSE switch-ii- dicator to off 2t. Lift tape read head cover and remove tape from tape reader 2u. Press EXECUTE switch-indicator to on to start diagnostic program 2v.
PAGE 188
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-24/2 Table 4-7. Computer Testing and Troubleshooting Teat procedure Normal indication Malfunction indication/correctie action 1. TEST SETUP . Check that the diagnostic alignment program is loaded into the computer is memory and that the computer is functional in accordame with table 4-6, 4-6.1, 4-6.2, or 4-63. 2. COMPUTER DIAGNOSTIC TEST NOTE During this test, any failure message listed in table 4-10 maybe printed.
PAGE 189
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-7. Computer Testing and Troubleshooting - Continued Test procedure Normal indication Malfunction indication/corrective action After approximately 15 minutes TTY prints out: DEPRESS OFF, ENT. PADS POWER SHOULD REMAINON NOTE Perform step 2d immediately after last TTY printout. PADS 2d. sequentially press ON/OFF switch-indicator and ENTER switch allowing at least 1 second between switches Computer power should remain on.
PAGE 190
PAGE 191
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-7. Computer Testing and Troubleshooting - Continued Test procedure Normal indication Malfunction indication/corrective action 2j. Turn TTY printer MOTOR switch to OFF 2k. Press SPU ON switch-indicator SPU ON switch-indicator goes off to OFF 2l. Disconnect computer from PADS test set 2m. Install operational memory, if required.
PAGE 192
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-8.
PAGE 193
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-9.
PAGE 194
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-9. PADS Diagnostic/Alignment Program Malfunction Words – Continued Malfunction Bit Location 10 11 12 13 14 15 AAL A X L DAC ANA, ORA DAL, DAR NRM BAFAIL (A/D SELF TEST) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Not used TAN +2.5V out of tol OVDC out of tol (±150 mV) TAN +2.
PAGE 195
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-9.
PAGE 196
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-9.
PAGE 197
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-9. PADS Diagnostic/Alignment Program Malfunction Words – Continued Malfunction Bit Location BDFAIL 3 (DISCRETE LONG LOOP TEST) (OUTPUT LINE FAILED “O” or “l”) o 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 IMU Flag Set (to CDU) +5 VDC 115 VAC +24 VDC BUFAIL (CDU TEST) o 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Serial data bus busy too long G.T.
PAGE 198
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-9.
PAGE 199
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-9. PALIS Diagnostic/Alignment Program Malfunction Words - Continued Bit Location Malfunction BIFAIL D (IMU DISCRETE TEST) o 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 IMU not ready at 4 min Gyro float not to temp at 14 min Gyro coarse htr on at 14 min Accel coarse htr on at 14 min AV clock not present NOTE: No 9 MAL or 10 MAL used.
PAGE 200
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-10. Computer Automatic Test Mode Malfunction Teletypewriter Messages Teletypewriter malfunction message Corrective action NOTE Absence of XXX TEST CYCLES PASS message at approximately 2-minute intervals or CPU OP-CODE TEST FAIL MEMORY TEST FAIL PRIORITY INTERRUPT TEST FAIL SERVICE INTERRUPT TEST FAIL DISCRETE I/O TEST FAIL PLATFORM I/O TEST FAIL 4-66 Change 1 Replace cards in sequence given 16-bit data circuit card assembly A2 Control no.
PAGE 201
ARMY TM 5-6675-308-34 MARINE CORPS- TM 08837A-34/2 Table 4-10. Computer Automatic Test Mode Malfunction Teletypewriter Massages – Continued Teletypewriter malfunction message Corrective action Data buffer circuit card assembly A6 I/O controller card assembly A7 SERIAL DATA I/O TEST FAIL Data buffer circuit card assembly A6 I/O controller card assembly A7 ANALOG DATA I/O TEST FAIL A/D converter circuit card assembly A11 I/O controller card assembly A7 Data buffer circuit card assembly A6 Control no.
PAGE 202
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-4.
PAGE 203
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-5.
PAGE 204
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-6.
PAGE 205
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-11. CDU Testing and Troubleshooting Test procedure Normal indication Malfunction indication/corrective action Before taking any corrective action or conducting any repairs, make certain that PS BATTERY and VEHICLE circuit breakers CB1 and CB2 are in OFF positions or damage to the equipment may result. NOTE The Test Procedure column contains the test operation to be performed.
PAGE 206
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-11.
PAGE 207
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-11. CDU Testing and Troubleshooting – Continued Test procedure Cable — Unit — W203P2 Tape Reader J1 W212P1 SPU 20J 12 W212 TTY W201P1 SPU 20J 1 W201P2 115VAC TTY Power 115VAC WIP1 CDU 4J1 W1P2 Computer 1J3 Normal indication Malfunction indication/corrective action lh Check that W4P 1 is not connected to IMU connector 2J3 1i. Press SPU ON switch-indicator to on lj. Set TTY printer MOTOR switch to ON lk.
PAGE 208
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-11. CDU Testing and Troubleshooting — Continued 2b. Press EXECUTE switch-indicator to on Malfunction indication/corrective action Normal indication Test procedure EXECUTE switch-indicator lights TTY prints out: (For core memory only) PADS DIAGNOSTIC MENT PROCRAM ALIGN- PROGRAM CHECKSUM XXXXXX SELECT TEST MODE 2b-1.
PAGE 209
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-11. CDU Testing and Troubleshooting — Continued Test procedure Normal indication Malfunction indication/corrective action Check continuity between lamp sockets and applicable pins of XA01 and XA02. Repair as required Change 1 4-74.1/(4-74.
PAGE 210
PAGE 211
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-11. CDU Testing and Troubleshooting – Continued Test procedure Normal indication 2f.
PAGE 212
ARMY TM 5-6675-308-34 MARINE C0RPS TM 08837A-34/2 Table 4-11. CDU Testing and Troubleshooting – Continued Test procedure Normal indication ALARM DS3 sounds for 1/2 second. The cycle repeats as long as LAMP pushbutton is held - Malfunction indication/corrective action ALARM DS3 sounds continuously: Check for shorts between E014 and and ground Replace display logic circuit card A2 2h. Press EXECUTE switch-indicator to off EXECUTE “switch-indicator goes off 2i.
PAGE 213
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-12.
PAGE 214
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 4-11. IMU Testing, Alignment, Troubleshooting, and Memory Matching Procedure. (3) Press + 2 twice to get to ID 32. Record the elevation in feet. a. General. The IMU test and alignment procedure is a lengthy (about 8 hours) test sequence which thoroughly checks out the IMU and recomputes many of the software calibration parameters if no hardware malfunctions are found. Most of the testing is performed automatically under computer control.
PAGE 215
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-7.
PAGE 216
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 4-80 Figure 4-8.
PAGE 217
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 NOTE: 1. LOCATE PADS 6 TO 16 METERS FROM SURVEY CONTROL POINT 2. OR lENT PADS SO THAT PORRO PRISM FACES 45° (±10°) TO ANY CARDINAL HEADING 3. ADJUST PADS ORIENTATION FOR PROPER AUTOREFLECTION FROM THE THEODOLITE 44-902-16C Figure 4-9.
PAGE 218
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14. IMU Testing r Alignment, and Troubleshooting Test procedure Normal indication Malfunction indication/corrective action NOTE This procedure uses tape reader, part no. 877406-1. The Test Procedure column contains the test operation to be performed. The Normal Indication column contains the desired test set or teletype response to the test operation. Malfunction indication(s) and corrective action(s) are listed in the third column.
PAGE 219
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14. IMU Testing, Alignment, and Troubleshooting – Continued Malfunction Test procedure Normal indication indication/corrective action 1i. Install IMU alignment data tape, for IMU being tested, on tape reader. Tape is located in storage container on IMU connector 2J2. Be careful not to tangle the coiled tape 1j. Set tape reader SPOOLING switch to ENABLE 1k. Press MEMORY LOAD switch-indicator to on MEMORY LOAD switchindicator lights.
PAGE 220
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14. IMU Testing, Alignment, and Troubleshooting – Continued Test procedure The fully loaded primary pallet weight exceeds the two person lift criteria. The weight may be reduced by removing the power supply while the pallet is being moved. NOTE Leaving CDU connected in lieu of SPU, enter SPH 800 to communicate with printer. 1v.
PAGE 221
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14. IMU Testing, Alignment, and Troubleshooting — continued Test procedure Cable W205P1 W205P2 Unit SPU 20J5 Buffer Unit 21J1 W209P1 W209P2 SPU 20J9 Computer 1J3 W203P1 SPU 20J3 Tape Reader J1 W203P2 W212 W212P1 SPU 20J12 W201P1 W201P2 SPU 20J1 115 VAC TTY Power W4P1 W4P2 W2P1 115 VAC IMU 2J3 PS 3J3 IMU 2J1 W2P2 Computer lJ1 Normal indication Malfunction indication/corrective action ly.
PAGE 222
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14. IMU Testing, Alignment, and Troubleshooting – Continued Test procedure Normal indication Malfunction indication/corrective action PADS DIAGNOSTIC ALIGNMENT PROGRAM or PADS SOLID STATE DIAGNOSTIC ALIGNMENT PROGRAM PROGRAM CHECKSUM XXXXXX SELECT TEST MODE 2b. Compare printed checksum Checksums are equal written on the front of the diagnostic-alignment tape or solid state program tape 2c.
PAGE 223
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14. IMU Testing, Alignment, and Troubleshooting – Continued Test procedure Normal indication Malfunction indication/corrective action NOTE TEST NUMBER X IN PROGRESS 000000. 000000 will print out periDo not move PADS again until in- odically during test to indicate the structed to do so. start of a subtest. The time since start may also be printed. If a failure occurs, the number will be nonzero and IMU, CMP, or PSU FAILURE will print.
PAGE 224
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14. IMU Testing, Alignment, and Troubleshooting – Continued Test procedure Normal indication 2k. If the theodolite is to be used, set it up to autoreflect on the porro prism and measure the horizontal angle from the target to the porro prism as shown in figure 4-9. Refer to chapter 5 for operation of theodolite.
PAGE 225
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.
PAGE 226
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14. IMU Testing, Alignment, anti Troubleshooting — Continued Test procedure Normal indication Malfunction indication/corrective action Ensure IMU is oriented to 45 ±10 degrees to any cardinal heading and the azimuth is correct. Type RDY. TTY will request a new measurement of the last horizontal angle followed by azimuth entry TTY prints: TYPE ONE OF: ACC REP BYP ALIGNMENT HALTED: Type REP and repeat theodolite test.
PAGE 227
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14. IMU Testing, Alignment, and Troubleshooting - Continued Test procedure 2u. Normal indication Malfunction indication/corrective action Set PS BATTERY and VEHICLE circuit breakers CB1 and CB2 to OFF 2v. Set TTY printer MOTOR switch to OFF 2w. Press SPU ON switch-indicator SPU ON switch-indicator goes off to off 2x. Disconnect equipment 2y.
PAGE 228
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1 IMU Testing, Alignment, and Troubleshooting Using Tape Reader, Part No. 877406-2 Test procedure Normal indication Malfunction indication/corrective action NOTE The Test Procedure column contains the test operation to be performed. The Normal Indication column contains the desired test set or teletype response to the test operation. Malfunction indication(s) and corrective action(s) are listed in the third column.
PAGE 229
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1. IMU Testing, Alignment, and Troubleshooting Using Tape Reader, Part No. 877406-2 - Continued Test procedure 1i. Lift tape reader read head cover; install IMU alignment data tape, for IMU being tested, on tape reader. Tape is located in storage container on IMU connector 2J2. Be careful not to tangle the coiled tape. Gently lower read head cover Normal indication Malfunction indication/corrective action No.
PAGE 230
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1 IMU Testing. Alignment. and Troubleshooting Using Tape Reader. Part No. 877406-2 Continued Teat procedure The fully loaded primary pallet weight exceeds the two person lift criteria. NOTE If the CDU is used in lieu of the SPU, enter SPH 800 to communicate with the printer. 1v. If the system is not on the align. ment surface, disconnect the test equipment and place the system on the alignment surface.
PAGE 231
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1 IMU Testing, Alignment. and Troubleshooting Using Tape Reader, Part No. 877406-2 – Continued Test procedure W203P1 Normal indication Malfunction indication/corrective action SPU 20J3 Tape Reader J1 TTY W203P2 W212 SPU 20J12 SPU 20J1 W212P1 W201P1 W201P2 115 VAC 115 VAC TTY Power W4P1 W4P2 W2P1 W2P2 IMU 2J3 PS 3J3 IMU 2J1 Computer 1J1 1y. Press SPU ON switch-indicator SPU ON switch-indicator lights to on 1z.
PAGE 232
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1 IMU Testing, Alignment, and Troubleshooting Using Tape Reader, Part No. 877406-2 – Continued Test procedure Normal indication SELECT TEST MODE Checksums are equal 2b. Compare printed checksum written on the front of the punched tape in use 2c. Type IMU to select IMU auto- TTY prints out: matic alignment and test se- IMU quence SER NO XXXX DATE XXXX CHECKSUM XXXXXX MOVE IMU TO APPROX 45 DEC HEADING WHEN DONE TYPE: RDY Data matches 2d.
PAGE 233
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4- 14.1 IMU Testing, Alignment, and Troubleshooting Using Tape Reader, Part No. 877406-2 Continued Normal indication Test procedure Malfunction indication/corrective action NOTE NOTE TEST NUMBER X IN PROGRESS 000000 Do not move PADS again until in000000 will print out periodically structed to do so. during test to indicate the start of a subtest. The time since start also may be printed.
PAGE 234
ARMY TM 5-6675-308-34 MARINE CORPS TM-08837A-34/2 Table 4-14.1 IMU Testing, Alignment, and Troubleshooting Using Tape Reader, Part No. 877406-2 -Continued Test procedure Normal indication Malfunction indication/corrective action At the end of a subtest, data may be printed out. The message AT LEAST ONE OUT-OF-CAL IN TEST NUMBER X means an out-of-tolerance parameter was recalibrated. It is not a failure message and no operator act ion is required. 2k.
PAGE 235
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1 IMU Testing, Alignment, and Troubleshooting Using Tape Reader, Part No. 877406-2 – Continued Test procedure Normal indication Malfunction indication/corrective action MOVE IMU TO X DEGREES PITCH X DEGREES ROLL WHEN DONE TYPE: RDY ALIGNMENT HALTED Obtain the desired pitch and roll angles by placing blocks under the primary pallet frame. Make sure the system cannot rock on the blocks. Level porro prism 2q.
PAGE 236
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1. IMU Testing, Alignment, and Troubleshooting Using Tape Reader, Part No. 877406-2 — Continued Test procedure Normal indication Malfunction indication/corrective action WHEN DONE TYPE: RDY ALIGNMENT HALTED: Ensure IMU is oriented to 45 ±10 degrees to any cardinal heading and azimuth is correct. Type RDY.
PAGE 237
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1. IMU Testing, Alignment, and Troubleshooting Using Tape Reader Part No. 877408-2Continued Test procedure Malfunction indication/corrective action Normal indication 2u. Set PS BATTERY and VEHICLE circuit breakers CB1 and CB2 to OFF 2v. Set TTY printer MOTOR switch to OFF 2w. Press SPUON switch-indicator SPU ON switch–indicator goes off to off 2x. Disconnect equipment 2y.
PAGE 238
PAGE 239
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-14.1. IMU Testing, Alignment, and Troubleshooting Using Tape Reader, Part No. 877406-2 Continued Test procedure 2u. Set PS BATTERY and VEHICLE circuit breakers CB1 and CB2 to off 2y. Set TTY printer MOTOR switch to OFF 2w. Press SPU ON switch-indicator to off Normal indication Malfunction indication/corrective action SPU ON switch-indicator goes off 2x.
PAGE 240
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-15. TTY Printout of IMU Test PADS DIAGNOSTIC ALIGNMENT PROGRAM OR PADS SOLID STATE DIAGNOSTIC ALIGNMENT PROGRAM PROGRAM CHECKSUM XXXXXX SELECT TEST MODE IMUIMU SER NO 0002 DATE 7312 CHECKSUM 003256 MOVE IMU TO APPROX 45 DEG HEADING WHEN DONE TYPE: RDY RDYRDY ENTER LATITUDE: (DEG) (MIN) (SEC) RDY 38 44 24.6NRDYRDY ENTER ELEVATION: (FT)RDY 52.
PAGE 241
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-15. TTY Printout of IMU Test - Continued MOVE IMU TO O DEGREES PITCH 8 DEGREES ROLL WHEN DONE TYPE: RDY ALIGNMENT HALTED RDYRDY -0.18 DEGREES PITCH 335 DEGREES ROLL ATTITUDE NOT WITHIN 2 DEGREES OF REQUESTED MOVE IMU TO O DEGREES PITCH 8 DEGREES ROLL WHEN DONE TYPE: RDY ALIGNMENT HALTED RDYRDY ENTER THEODOLITE READING: (MILS) RDY ALIGNMENT HALTED 2865 .16RDYRDY -0.0424 DEGREES PITCH 10-SEC AVRGE 9.
PAGE 242
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-15.
PAGE 243
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-15. TTY Printout of IMU Tast – Continued TEST NUMBER 5 IN PROGRESS STARTED 3 MINUTES AGO 000000 000000 100 102 1017 1018 1019 0.1758 0.0 5.6 -0.0014 -0.0077 0.1741 44.6 OK OK OK OK OK ARC SEC DEG/HR DEG/HR DEGREES ARC SEC TEST NUMBER 6 IN PROGRESS STARTED 2 MINUTES AGO 000000000000 0.6799 DEG/HR 0.6742 OK 3 OK PERCENT 9 -0.024 -0.020 000000000000 TEST NUMBER 8 IN PROGRESS 000000000000 Ooc 69.2 82 122.6 83 122.7 106.
PAGE 244
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-15.
PAGE 245
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-15. TTY Printout of IMU Test – Continued TEST NUMBER 6 IN PROGRESS STARTED 2 MINUTES AGO 000000 000000 DEG/HR 3 0.6799 0.6742 OK PERCENT OK -0.024 -0.020 9 000000 000000 Z GYRO PERM BIAS Z GYRO SCL FCT CHNG TEST NUMBER 8 IN PROGRESS 000000 000000 OOC 122.6 82 69.2 83 122.7 106.
PAGE 246
PAGE 247
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-15. TTY Printout of IMU Test – Continued 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 200 SER NO 132.2 107.0 69.2 122.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 -19.9 48.4 0.0000 0.0000 0.1112 0.0552 0.1961 0.0723 -0.0139 -607.2 -2488.0 -0.2124 0.6275 0.000 0.
PAGE 248
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-16. Definitions of Teletypewriter Input Messages Definition Teletypewriter input message TTY REQUEST: DATA ENTRY : LATITUDE Latitude of the test site referenced to Clark 1866 spheroid. Degrees, minutes, seconds (separated by a space) to nearest second.
PAGE 249
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-17. IMU Automatic Test Mode Malfunction Teletypewriter Messages Corrective action Teletypewriter malfunction message IMPROPER DATA ENTRY Data must be reentered Program did not recognize data entry ALIGN TIMING IMU FAIL Reasonability test fail Program cannot advance.
PAGE 250
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 4-12. Operational Program Loading. (Core memory only.) card so it will not be confused with any new replacements. a. General. The PADS operational program must be loaded into memory after the diagnostic program has been run. Usually, this will be after the IMU alignment.
PAGE 251
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18. Operational Program Loading Test procedure Normal indication Malfunction indication/corrective action NOTE This procedure uses tape reader, part no. 877406-1. The Procedure column contains the operation to be performed. The Normal Indication column contains the desired test set response to the operation. The malfunction indication(s) and corrective action(s) are listed in the third column.
PAGE 252
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18. Operational Program Loading — Continued Test procedure W204P1 SPU 20J4 W204P2 Computer 1J1 W209P1 SPU 20J9 W209P2 Computer 1J3 W203P1 SPU 20J3 W203P2 Tape reader J1 W212 TTY W212P1 SPU 20J12 W201P1 SPU 20J1 W201P2 115 VAC TTY power 115 VAC Normal indication Malfunction indication/corrective action f. Check that W4P1 is not connected to IMU connector 2J3 g. Set tape reader SPOOLING switch to DISABLE h.
PAGE 253
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18. Operational Program Loading — Continued Test procedure Normal indication Malfunction indication/corrective action j. Install PADS operational program tape number 877419-X on tape reader. Do not tape program tape to take-up reel. Manually advance tape beyond readable tape leader k. Turn on + 28V power source l. Set PS BATTERY and VEHICLE breakers CB1 and CB2 to ON m.
PAGE 254
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18. Operational Program Loading — Continued Test procedure Normal indication t. Wait 15 seconds and press EXECUTE switch-indicator to off EXECUTE switch-indicator goes off u. Press MEMORY LOAD switchindicator to on MEMORY LOAD switch-indicator lights Tape reader reads rest of tape and stops at end of reel v. Press MEMORY LOAD switch- MEMORY LOAD switch-indicator indicator to off goes off w.
PAGE 255
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18. Operational Program Loading – Continued Test procedure ae. Press REVERSE switch-indicator to on Normal indication Malfunction indication/corrective action REVERSE switch-indicator lights Tape rewinds and stops at beginning af. Press REVERSE switch-indicator to off REVERSE switch-indicator goes off ag.
PAGE 256
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18. Operational Program Loading — Continued Test procedure Normal indication as. After elevation is entered, press MON, ID, 1, 4, ENT pushbuttons Data display shows: at. Compare CDU checksum readout to the program checksum written on front of the operational program tape Checksums are equal au.
PAGE 257
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18.1. Operational Program Loading Using Tape Reader, Part No. 877406-2 Test procedure Normal indication Malfunction indication/corrective action NOTE The Procedure column contains the operation to be performed. The Normal Indication column contains the desired test set response to the operation. The malfunction indication(s) and corrective action(s) are listed in the third column.
PAGE 258
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18.1. Operational Program Loading Using Tape Reader, Part No. 877406-2 – Continued Test procedure W204P2 Computer 1J1 W209P1 SPU 20J9 W209P2 Computer 1J3 W203P1 SPU 20J3 W203P2 Tape reader J1 W212 TTY W212P1 SPU 20J12 W201P1 SPU 20J1 W201P2 115 VAC TTY Power 115 VAC Normal indication Malfunction indication/corrective action f. Check that W4P1 is not connected to IMU connector 2J3 g. Press SPU ON switch-indicator to on.
PAGE 259
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18.1. Operational Program Loading Using Tape Reader, Part No. 877406-2 — Continued Test procedure j. Lift tape reader read head cover and install PADS operational program tape number 877419-X on tape reader. Do not tape program tape to take-up reel. Manually advance tape beyond readable tape leader. Gently lower read head cover Normal indication Malfunction indication/corrective action No. 10 LED indicator lights steady k.
PAGE 260
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18.1. Operational Program Loading Using Tape Reader, Part No. 877406-2 – Continued Test procedure Normal indication u. Wait 15 seconds and press EXECUTE switch-indicator to off EXECUTE switch-indicator goes off v. Press MEMORY LOAD switchindicator to on MEMORY LOAD switch-indicator lights Tape reader reads rest of tape and stops at end of reel w. Press MEMORY LOAD switch- MEMORY LOAD switch-indicator goes off indicator to off x.
PAGE 261
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18.1. Operational Program Loading Using Tape Reader, Part No. 877406-2 — Continued Test procedure Normal indication Malfunction indication/corrective action ae. Press MEMORY LOAD switch- MEMORY LOAD switch-indicator indicator to off goes off af. Deleted ag. Press REVERSE switch-indica- REVERSE switch-indicator lights tor to on Tape rewinds and stops at beginning ah. Press REVERSE switch-indica- REVERSE switch-indicator goes off tor to off ai.
PAGE 262
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-18.1. Operational Program Loading Using Tape Reader, Part No. 877406-2 – Continued Test procedure Normal indication Malfunction indication/corrective action av. Turn on PADS via CDU and advance to monitor mode NOTE Zeros may be entered for values of survey parameters. aw. After elevation is entered press Data display shows: MON, ID, 1, 4, ENT pushbut- 14 MCS XXXXX (checksum) tons ax.
PAGE 263
PAGE 264
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-10.
PAGE 265
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19. PS Testing and Troubleshooting Malfunction indication/corrective action Normal indication Test procedure The PS contains 115 volts ac. DEATH OR SERIOUS INJURY may result from contact with 115 volts ac. Be careful when performing the PS testing and troubleshooting procedure. DEATH OR SERIOUS INJURY may result if power is not turned off before removing covers, unsoldering wires, or measuring resistance.
PAGE 266
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19. PS Testing and Troubleshooting – Continued Test procedure Normal indication Cable Unit W304P1 PS 3J4 W304P2 PSTS J6 W305P1 PS 3J2 W305P2 PSTS J7 W311P1 PSTS J5 W311P2 +28V W306P1 PSTS J4 W306 o to +40V Oscilloscope power 115VAC Digital voltmeter (DVM) power 115VAC le. Disconnect power supply fan cable from connector J6 2. PS TESTINGS 2a.
PAGE 267
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19. PS Testing and Troubleshooting – Continued Test procedure Normal indication Switch Malfunction indication/corrective action Setting POWER SUPPLY FLAG OFF COMP PS OFF 2b. Set CB1 and CB2 circuit breakers to off 2c. Turn on external +28V power source and adjust to +28V ( l)V 2d. Turn on external O to +40V power source and adjust to +0.5 ( 0 .25)V. Adjust the current limit for 5 to 7 amps 2e.
PAGE 268
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19.
PAGE 269
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19. PS Testing and Troubleshooting – Continued Test procedure Normal indication Malfunction indication/corrective action 2r Connect DVM test leads to POWER SUPPLY HTR 1 and PWR RTN test jacks DVM indicates 0 (~0.9) VDC Measure voltage between K2-X1 and K2-X2. If less than 10V, replace K2; if greater than 10V, replace sequence monitor circuit card assembly A5 2s.
PAGE 270
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19. PS Testing and Troubleshooting – Continued Test procedure 2ad. Press POWER SUPPLY OFF switch, set FUNCTION switch to 115 LO, press POWER SUPPLY ON switch, and connect multimeter to 115V ~90 and PWR RTN test jacks Normal indication Malfunction indication/corrective action Multimeter indicates 100 to 121 VAC Use oscilloscope to determine if +17.0V remains on. If it does not, replace +17V, converter-regulator circuit card assembly A 1.
PAGE 271
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19. PS Testing and Troubleshooting – Continued Test procedure Malfunction indication/corrective action DVM indicates 0 (±0.1) VDC Voltage out of tolerance: Replace sequence monitor circuit card assembly A5, then K2 2av. Set multimeter to AC volts.
PAGE 272
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19. PS Testing and Troubleshooting – Continued Test procedure Normal indication Malfunction indication/corrective action 2bd. Set FUNCTION switch to PS 115V &O 2be. Set POWER SUPPLY FLAG switch to RESET PS FAIL fault indicator DS2 goes black 2bf.
PAGE 273
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19. PS Testing and Troubleshooting – Continued Test procedure Normal indication Malfunction indication/corrective action 2bt. Adjust 0 to +40V external power source to +28, then to +24 (±0.5)V. Measure power supply voltage at POWER SUPPLY PWR IN and PWR RTN test jacks BATTERY indicator goes off BATTERY indicator lights: Replace sequence monitor circuit card assembly A5 2bu.
PAGE 274
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-19. PS Testing and Troubleshooting - Continued Test procedure 2cc. Slowly decrease external +28V power source until CHARGE indicator goes off Normal indication DVM indicates +22.5 to +24V Same as step 2by PS ON indicator lights. 2cd. Set MODE switch to NO LOAD. Set BATTERY indicator goes PS VEHICLE circuit breaker CB2 to OFF. Press POWER SUPPLY ON switch ON 2ce. Set PS BATTERY circuit breaker CB1 to OFF 2cf.
PAGE 275
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-11.
PAGE 276
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-11. Power Supply Circuit Card Adjustment Locations (Sheet 2 of 2) d. PS Troubleshooting Subroutine No. 1 - Input Power Short and Continuitv Checks. This subroutine checks the circuits that carry the + 24v input power ahead of the main relay K1. The power supply runs on + 24V from either the vehicle battery at 3J4 or the backup battery at 3J2.
PAGE 277
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 (12) Set BATTERY and VEHICLE circuit breakers CB1 and CB2 to ON. (13) If short is removed, replace battery charger circuit card assembly A7. (14) Set BATTERY and VEHICLE circuit breakers CB1 and CB2 to OFF. (15) Set PSTS INPUT POWER UUT circuit breaker to OFF. (16) Set INPUT POWER PSTS circuit breaker to OFF. (17) Set 0 to + 40V input power source to off. (18) Reinstall battery charger circuit card assembly A7.
PAGE 278
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 (6) Start removing one at a time, until short is removed, the power inverter assembly A6, 28V converter-regulator circuit card assembly A3, + 17V converter-regulator circuit card assembly Al, + 20V converter-regulator circuit card assembly A2, and sequence monitor circuit card assembly A5, Monitor standoff terminals El and E2 until short disappears.
PAGE 279
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 (19) Set INPUT POWER UUT circuit breaker to ON. (20) Set 0 to + 40V input power source to on, (21) Set BATTERY and VEHICLE circuit breakers CB1 and CB2 to ON. (22) Check for + 12V at sequence monitor circuit card assembly AS connector P2-1. (23) If + 12V is present, perform the following steps: (a) Set BATTERY and VEHICLE circuit breakers CB1 and CB2 to OFF. (b) Set PSTS INPUT POWER UUT circuit breaker to OFF.
PAGE 280
ARMY TM 8-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-12.
PAGE 281
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-13.
PAGE 282
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-20. Computer Power Supply Testing and Troubleshooting Normal indication Test procedure Malfunction indication/corrective action Before removing covers or circuit cards, disconnect power from the power supply by setting COMP PS switch and INPUT POWER UUT circuit breaker to OFF or damage to equipment may result.
PAGE 283
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-20. Computer Power Supply Testing and Troubleshooting - Continued Test procedure 2. Normal indication Malfunction indication/corrective action COMPUTER POWER SUPPLY TEST. 2a. Set switches as follows: Switch COMP PS INPUT POWER PSTS INPUT POWER UUT MODE FUNCTION Setting OFF OFF OFF OVERLOAD COMP PS + 5V REFERENCE AMB TEMP V LAMP 0 VDC OFF SELF TEST 2b. Turn on external +28V power source 2c.
PAGE 284
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-20. Test procedure Computer Power Supply Testing and Troubleshooting—Continued Normal indication Malfunction indication/corrective action .
PAGE 285
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-20. Computer Power Supply Testing and Troubleshooting – Continued Test procedure 2x. Set COMP PS switch to OFF Normal indication Malfunction indication/corrective action COMP PS ON indicator goes off 2y. Set REFERENCE AMB TEMP V LAMP switch to O V 22. Set FUNCTION switch to COMP PS +15V PREC 2aa. Set COMP PS switch to ON COMP PS ON indicator lights 2ab.
PAGE 286
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-20. Computer Power Supply Testing and Troubleshooting – Continued Test procedure Normal indication Set COMP PS switch to ON Oscillsocope trace rises to +3 to +6V when switch is set and then drops to 0 to 0.5 VDC after 0.5 to 1.5 seconds and remains at this level If the voltage is out of tolerance, replace 15V power supply circuit card assembly A2 Connect the oscilloscope to OFF and PWR RTN test jacks.
PAGE 287
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Section IV. MAINTENANCE OF PADS 4-15. General. a. Maintenance of PADS allocated to general support by MAC consists of testing and repair of computer, computer power supply, control and display unit, inertial measurement unit, and power supply. 4-16. Computer Maintenance. Computer maintenance consists of computer and computer power supply testing and repair. a. Computer Testing. Testing is performed using the PADS test set as described in paragraph 4-9. b.
PAGE 288
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-14.
PAGE 289
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 4-14 1. Washer 2. Screw 3. Computer cover 4. CDU mount bracket 5. Catch strike 6. Screw 7. Solid state memory unit A1 7.1 Core memory unit A1 8. Screw 9. Wedgelock 10. Computer subassembly 11. Washer 12. Screw 13. Air deflector 14. Screw 15. Washer 16. Guide pin 17. Captive screw assembly 18. Computer power supply 19. RFI gasket 2. Prepare and solder tagged wires to elapsed time indicator M1 (25). Clean solder joints. 3.
PAGE 290
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Cut length of 28 AWG stranded insulated wire long enough to connect termination points of damaged circuitry. Strip insulation for a length of 1/8 inch at each end of wire. Solder wire to terminations using standard shop practices.
PAGE 291
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-15.
PAGE 292
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 4-15 1. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. Screw Washer Cover RFI gasket Wiring harness A3 Screw Washer Spacer Nut Chassis Screw Washer Guide pin Captive screw 5V power supply circuit card assembly Al Wedgelock Screw Captive screw End plate Captive screw Gasket 15V power supply circuit card assembly A2 Table 4-21. Computer Power Supply Circuit Card Assembly Identification Card part no.
PAGE 293
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 downward until the bottom wedges become loose. 3. Loosen six captive screws (18) securing 5V ower supply circuit card assembly A1 (15) and 15V power supply circuit card assembly A2 (22) heat sinks to chassis (10). 4. Use a card extractor to remove 5V power supply circuit card assembly A1 (15) and 15V power supply circuit card assembly A2 (22). 5. Remove 14 screws (1) and washers (2) securing cover (3) to chassis (10); remove cover. 6.
PAGE 294
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-16.
PAGE 295
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4-22.
PAGE 296
ARMY TM 5-6675-308-34 MARlNE C0RPS TM 08837A-34/2 Table 4-22. Computer Power Supply Wiring Harries A3 Wiring Data-Continued From To Branch Color NOTES 1. All wire is MIL-W-16878/4, Type E-22, 19 strands, except wire between A2-30 and A2-31 which is uninsulated, type S, 22 AWG, solid, soft, tinned. 2. Termination points A3-1, etc, are located on interconnect printed wiring board as shown on figure 4-16. 4-17. CDU Maintenance. a. CDU Testing.
PAGE 297
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-17.
PAGE 298
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 4-17 Screw Lockwasher 3. Washer 4. Relay K1 5. Diode CR1 6. Display logic circuit card assembly Al 7. Display logic circuit card assembly A2 8, Keyboard and control circuit card assembly A3 9. Control display unit holder 10. Screw 11. Washer 12. Control and display unit cover 13. Audible alarm DS3 14. Audible alarm gasket 15. Nut 16. Terminal lug 17. Screw 18. Washer Nut 20. JacksCrew 2. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33.
PAGE 299
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 control display unit holder (9). Move relay K1 (4) away from holder far enough to permit access to wires. 3. Tag and unsolder wires connected to relay K1 (4); remove relay. 4. Unsolder and remove diode CR1 (5). (b) Replacement. 1. Prepare and install plastic tubing on diode. Solder diode CR1 leads to relay terminals observing polarity and note of figure 4-17. 2. Solder tagged wires to terminals of relay K1 (4). 3.
PAGE 300
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 (30) securing control and display unit panel (31) to control and display unit cover (12) 5 inch-pounds using procedures described in paragraph 3-11. 6. Inspect gasket (32). Replace if cracked, tom, loose, or excessively compressed. 7. Position control and display panel (31) against control and dis la unit cover (12).
PAGE 301
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 control circuit card assembly A3 (8) following procedures described in 3-17a(l). (b) Repair. 1. Cut length of 28 AWG stranded insulated wire long enough to connect termination points of darnaged circuitry. Strip insulation for a length of 1/8 inch at each end of wire. 2. Solder wire to termination using standard shop practices. 3. Tack wire to flexprint at one-inch-intervals in accordance with the following steps.
PAGE 302
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-18.
PAGE 303
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 4-18 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Screw Washer Cover plate Thermostatic switch S3 Capacitor C3 Capacitor C4 Gasket Screw Clamping catch Washer Nut Upper IMU subassembly Lower IMU subassembly 14. Guide pin 15. Porro prism cover 16. Screw 17. Washer 18. Clamping catch 19. Porro prism 20. Lockwasher 21. Screw 22. Retainer nut 23. Washer 24. Bolt assembly 25. IMU cover gasket (46) to chassis (22); remove cover and gasket. 4.
PAGE 304
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-19.
PAGE 305
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 . Figure 4-19.
PAGE 306
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-19.
PAGE 307
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 4-19 1. Captive screw 2. Washer 3. Side cover . 4. Gasket 5. Jackscrew 6. Connector A7P1 7. Screw 8. Washer 9. Washer 10, Terminal lug 11. Shouldered washer 12. Transistor A7Q6 13. Thermal pad 14. Capacitor A7C3 15. Screw 16. Washer 17. Washer 18. Shouldered washer 19. Terminal lug 20. Transistor A7Q7 21. Thermal pad 22. Chassis 23. Battery charger circuit card assembly A7 24. Captive screw 25. Thermal pad 26.
PAGE 308
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-20.
PAGE 309
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-20.
PAGE 310
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-20.
PAGE 311
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-20.
PAGE 312
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 . Figure 4-20.
PAGE 313
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-20.
PAGE 314
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 4-20 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. 56. 57.
PAGE 315
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Legend for Figure 4-20 – Continued 115. Reactor L1 116. Standoff terminal E37 117. Capacitor C2 118. Standoff terminal E36 119. Capacitor C3 120. Screw 121. Washer 122. Shoulder washer 123. Terminal lug 124. Washer 125. Capacitor Cl 126. Standoff terminal E35 126.1 Thermostatic switch S2 126.2 Capacitor C5 127. Screw 128. Washer 129. Interconnection assembly A8 130. Output falter circuit card assembly A9 131. Screw 132. Washer 133. Nut 134. Washer 135.
PAGE 316
PAGE 317
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Table 4–23. Power Supply Circuit Card Assembly Identification Figure no. and index no. Card part no. Card nomenclature and reference designator Part no.
PAGE 318
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 4. Remove + 20V converter-regulator circuit card assembly A2 (50) from chassis (22). (b) Replacement. 1. Insert + 20V converter-regulator circuit card assembly A2 (50) into slot in chassis (22) and carefully guide it into place. 2. Just before the connectors mate, check that the + 20V converter- regulator circuit card assembly A2 (50) is free in its guides and its top edge is parallel to the chassis (22) top surface. 3.
PAGE 319
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 downward until the bottom wedges become loose. 4. Remove filter circuit card assembly A4 (68) from chassis (22). (b) Replacement. 1. Insert filter circuit card assembly A4 (68) into slot in chassis (22) and carefully guide it into place. 2. Just before the connectors mate, check that the filter circuit card assembly A4 (68) is free in its guides and its top edge is parallel to the chassis (22) top surface. 3.
PAGE 320
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 6. Remove screw (36) and lockwasher (37) securing terminal lugs (38, 39 and 40) to power inverter assembly A6 (26); remove terminal lugs. 7. Loosen seven captive screws (27) securing power inverter assembly (26) and thermal pad (25) to chassis (22); remove power inverter assembly and thermal pad. (b) Replacement. 1. Install power inverter assembly A6 (26) and thermal pad (25) into chassis (22) and secure with seven captive screws (27). 2.
PAGE 321
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 A7C3 (14) attached to one of the terminal lugs, and shouldered washer (11). 5. 6. . Mate connector A6P1 (41) with power inverter assembly A6 (26) connector and secure with two jackscrews (42). Secure side cover (3) and gasket (4) to chassis (22) with 19 captive screws (1) and washers (2). Torque screws to 9 inchpounds using procedures described in paragraph 3-11. (8) Interconnect and output jilter wiring harness.
PAGE 322
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 10. Install + 10V converter-regulator circuit card assembly A2 (50) in accordance with paragraphs 4-19b(2)(b)l thru 4-19b(2)(b)5. 11. 12. 13. 14. Install 28V converter-regulator circuit card assembly A3 (63) in accordance with paragraphs 4-19b(3)(b)l thru 4-19b(3)(b)6. Install filter circuit card assembly A4 (68) in accordance with paragraphs 4-19b(4)(b)l thru 4-19b(4)(b)5.
PAGE 323
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 4. Open circuit breaker cover and remove two screws (22 and 23) and washer (24) securing circuit breaker to chassis (8); remove circuit breaker CB1. (f) Circuit breaker CB2 replacement. NOTE Discard hardware supplied with new circuit breaker except flat washers. 2. Tag and unsolder wires and diode CR7 (147) from relay K3 (146); remove relay (j) Relay K3 replacement. 1. Prepare and solder tagged wires and diode CR7 (147) to relay K3 (146). 2.
PAGE 324
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 3. Secure fault indicator DS2 (46) with nut (57) and lockwasher (58). Tighten nut sufficiently to hold but not enough to reduce adhesive thickness to less than 0,010 inch. 4. Cure adhesive for 72 hours minimum. 5. Prepare and solder tagged wires and diodes CR9 (47, figure 4-20, sheet 4) and CR10 (48) to fault indicator DS2 (46, figure 4-20, sheet 3) (m) Relay K2 removal. 1.
PAGE 325
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 5. Secure two terminal lugs (65 and 66) to rectifier CR3 (67) with screw (64), nut (69), and washer (68). W3 (93); tag wires and remove terminal lugs. 2. Remove screw (107) and washer (108) securing two terminal lugs (109 and 110) to bus bar W4 (111); tag wires and remove terminal lugs. 3. Remove screw (92) and countersunk lockwasher (102) securing bus bar W3 (93) to reactor L2 (97). 4.
PAGE 326
ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 2. Remove screw (120), washer (121), and shoulder washer (122) securing terminal lug (123) to chassis (8). 3. Unsolder capacitor terminal lug (123); remove capacitor. (z) Capacitors C1, C2, and C3 replacement. 1. Clean old adhesive from area on chassis (8) where capacitor is to be installed. 2. Prepare and solder capacitor and tagged wires to standoff and terminal lug. 3.
PAGE 327
ARMY TM 5-6675-308-34 MAR INE CORPS TM 08837A-34/2 Figure 4-21. Output Filter Circuit Card Assembly A9 Parts Location Diagram Change 5 4-168.1/(4-168.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 NOTE To loosen or tighten backshell components. mate the connector to a chassismounted connector. Use of the strap wrench is shown in figure 4-22. b. Backshell Disassembly/Assembly. Several styles of backshells are used with PADS cables and are illustrated in figures 4-23 and 4-24. Cables may differ in minor details such as use of shields, etc. Adapt the procedure as appropriate for the particular connection. (1) Straight backshell disassembly.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-23. Straight Backshell Disassembly/Assembly Figure 4-24.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 (c) (d) Flare shield and terminate against RFI ring. (e) Screw cable clamp ring onto rear of backshell. Tighten enough to compress grommet. Slide environmental ring, grommet, and grommet ring into end of backshell. (f) Tighten screws to tighten cable clamp around cable. (3) Right angle backshell disassembly. See figure 4-24 and disassemble backshell as follows: (a) Slide cable marker away from connector to allow clearance for disassembly.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 4-172 Table 4-24.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-25. Contact Pins and Insertion and Removal Tools Figure 4-26.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 the positioner is seated on the tool; then secure the 9/64-inch socket head screws with a sockethead screw key. Turret should now index easily without binding. (e) Disengage the tool from the contact pin. (3) Insertion. (a) Clip insertion tool around wire and slide tool against contact shoulder. See figure 4-27, view A.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-27. Contact-Pin Insertion-Tool Loading (b) Turn knurled screw until index line on nest die is aligned with proper cable size on cable scale. (c) Lock nest die by tightening nest die lock screw. (4) Insert stripped end of cable into lug barrel. (5) Insert cable and terminal assembly into the open nest die so the terminal barrel is centered in the die. See figure 4-33. (6) Close crimping tool handles until stop hits the other handle.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 1. CONTACT PIN SIZE 22. SELECTOR NUMBER 4 2. THE TOOL HANDLES MUST BE FULLY OPENED WHEN INSERTING THE POSITIONER AND WHEN CHANGING THE SELECTOR POSITION Figure 4-28.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-29.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-31.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 4-32. Terminal Lug and Wire Preparation Figure 4-33.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 CHAPTER 5 MATERIEL USED IN CONJUNCTION WITH MAJOR ITEM 5-1. General. The Position and Azimuth Determining System Test AN/USM-427 is used to test the PADS computer, CDU, and IMU. Its operation is described in TM 5-6675-238-14. Marine Corp users shall refer to TM 08839A-14/1 a. The Power Supply Test Set AN/USM-428 is used to test the PADS power supply and computer power supply. Its operation is described in TM 5-6675309-14.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 5-1.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 5-1.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 of the instrument. The vertical circle level is completely built-in and is located adjacent to the vertical circle. (c) Collimation level tangent screw. The collimation level tangent screw is located below the vertical circle and on the same standard. This control is used for precise leveling of the vertical circle level (split bubble) by bringing the images of the ends to the bubble into coincidence.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 5-3. Target Set. (See figure 5-2). The target set includes a target, tribrach, and artificial illumination device. The tribrach is the same that is used with the theodolite and is provided with leveling screws and an optical plumb. The target is black on white to provide a sharp aiming point.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 (1) Grasp the carrying strap with both hands just above the two clamping levers and pull outward to release the clamping levers from the base assembly. (2) Lift the dome-shaped cover directly off the instrument and lay it to one side, (3) Release the three clamps which secure the theodolite to the case base. Grasp the theodolite by the standard that has the trademark inscribed on it and lift the theodolite off the base.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 eliminated, the crossline will remain fixed on the object as the eye is moved. If all parallax has not been eliminated, the crossline will appear to move back and forth across the object.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 5-3. Horizontal Circle Readings e. Read the horizontal circle. The reading should be 0.150 (within ±0.100 roil), With care, a circle may be set to an accuracy of 0.010 mil. 5-7. Pointing the Theodolite. a. Release the horizontal and vertical clamping screws. b. Aim the telescope on the target. Focus as necessary. c. When the telescope crosshairs are on the target, tighten the horizontal and vertical clamping screws.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 5-4. Leveling the Porro Prism Figure 5-5.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure 5-6. Measuring Horizontal Angles Verify the telescope is properly pointed on the target and record the horizontal circle reading (0.158 mil). With the telescope in the direct (D) position, turn it in a clockwise direction and autoreflect on the porro prism. Record the horizontal circle reading (824.376 mils). Plunge the telescope to the reverse (R) (sight on bottom) position.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 5-11. Care of the Theodolite. The theodolite is a delicate instrument, and care must be taken not to drop it or bump it against any object. If the instrument gets wet, it must be dried before it is returned to the carrying case. As soon as possible, the instrument should be placed in a dry room or tent. It should be removed from the carrying case so that it may dry completely.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Test. To test the optical plumb, suspend the plumb bob from the leveled instrument and mark a point on the ground exactly under the point of the plumb bob. Remove the plumb bob from the instrument and check to insure that the instrument is accurately leveled (i.e., the vertical axis is truly vertical). Look into the eyepiece of the optical plumb. If it is in correct adjustment, the mark on the ground will be centered in the reticle. c. Adjustment.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 reverse points is less than 0.05 mil (10”). When this adjutment is completed, repeat the verticality test to insure that the vertical crossline is still perpendicular to the horizontal axis of the tele. scope. NOTE This adjustment can also be made with the telescope in the reverse position, using the mean value for the reverse pointing, i.e., 3,200.500. 5-19. Vertical Collimation Adjustment. a. Purpose.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 c. Circle-Setting Knob. To adjust the circle-setting knob, turn the knob until three screws can be seen through the three holes in the face of the knob, Carefully loosen these screws enough to press the knob upward or downward to loosen or tighten the movement. d. Tripod. There should be no play at the junction of the wood and metal parts of the tripod.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 APPENDIX A REFERENCES A-1. Painting TM 43-0139 Painting Instructions for Field Use A-2.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 DA Pam 750-10 SL l-2/SL 1-3 700-20 U.S. Army Equipment Index of Modification Work Orders Army Adapter/Other Items Selected for Authorization List of Portable Items TM 4700-15/1 Equipment Record Procedures A 2 Change 1 TM 9-6140-200-14 Operator’s, Organizational, Direct Support, and General Support Maintenance Manual for Storage Lead-Acid Batteries.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 GLOSSARY Section I. DEFINITIONS OF SPECIAL TERMS A ACCELEROMETER – Electric transducer used to measure linear acceleration. AUTOREFLECTION – A method of directing a straight line by projecting an image of theodolite sight to a reflecting plane and then back to the telescope. AZIMUTH – Horizontal angle measured clockwise from true north (true azimuth), or from grid north (grid azimuth), to a line through an observed or designated point.
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ARMY TM 5-6675-308-34 MARINE CORP5 TM 08837A-34/2 R RESOLVER – Senses synchro error signal and drives torquer to remove angular orientation difference between stable element and vehicle. S SPHEROID – An earth spheroid model used for computing geodetic positions. There are seven spheroid systems which PADS can accommodate.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 IMU - Inertial measurement unit SCR - Silicone controlled rectifier I/O - Input/output SDB - Serial data bus MAC - Maintenance allocation chart SEL - User selected data M151 - Standard U.S. Army jeep with pintle mount SPH - Spheroid OH-58 - Helicopter SPU - Signal processor unit PADS - Position and azimuth determining system SUSV - Small unit service vehicle PLMB - Standard U.S.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 00837A-34/2 INDEX subject Paragraph Figure, Table, Number A Adjustments: Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..... Horizontal collimation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 INDEX subject Paragraph, Figure, Table, Number CDU circuit card identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T 3-6 CDU exploded view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARlNE CORPS TM 08837A-34/2 INDEX – Continued Paragraph, Figure, Table, Number Subject Computer test, TTY printout of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T 4-8 Computer testing and troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 INDEX - Continued Subject Paragraph, Figure, Table, Number H Heater air intake system, removal of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Helicopter pallet modification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 INDEX – Continued Paragraph Figure, Table, Number Subject IMU transit case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 INDEX – Continued Subject Paragraph, Figure, Table, Number Subroutine no. 3 – relay check . . . . . . . . . . . . . . . . . . . . . . .. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13f Subroutine no. 4 – AUX + 24V and + 12V checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13g Test equipment and materials. . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 INDEX – Continued Subject Remove and replace – IMU: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ambient temperature thermostatic witch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolt assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 INDEX – Continued Paragraph, Figure, Table, Number Subject S Small utility support vehicle (SUSV) modification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setting up the theodolite and target set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 INDEX — Continued Paragraph, Figure, Table, Number Subject V Vehicle example. nonstandard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Verticality adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vertical collimation adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F3-1.1 5-17 5-19 W Winterization kit . . . . . . . . . . . . . . . . . . . . . . . . .
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-2.
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ARMY TM 5-6475-303-34 MARINE CORPS TM 08837A-34/2 Figure FO-3.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 NOTE 1. REFERENCE DESIGNATIONS ARE ABBREVIATED. PREFIX THE DESIGNATION WITH UNIT NUMBER, ASSEMBLY, OR SUBASSEMBLY DESIGNATION, AS APPLICABLE 2. CAPACITANCE VALUES ARE IN MICROFARADS. Figure FO-5.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-2.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-3.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 NOTE 1. REFERENCE DESIGNATIONS ARE ABBREVIATED. PREFIX TNE DESIGNATION WITH UNIT NUMBER, ASSEMBLY, OR SUBASSEMBLY DESIGNATION, AS APPLICABLE 2. CAPACITANCE VALUES ARE IN MICROFARADS. Figure FO-5.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-2.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-3.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 Figure FO-4.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 NOTE: 1. REFERENCE DESIGNATIONS ARE ABBREVIATED. PREFIX THE DESIGNATION WITH UNIT NUMBER, ASSEMBLY, OR SUBASSEMBLY DESIGNATION, AS APPLICABLE 2. CAPACITANCE VALUES ARE IN MICROFARADS. Figure FO-5.
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ARMY TM 5-6675-308-34 MARINE CORPS TM 08837A-34/2 By Order of the Secretaries of the Army and the Navy: JOHN A. WICKHAM, JR. Genera1, United States Army Chief of Staff Official: DONALD J. DELANDRO Brigadier Genera1, United States Army The Adjutant General Official: GEORGE B. CRIST Lieutenant General, USMC D e p u t y Chief of Staff for Installation and Logistics DISTRIBUTION: To be distributed in accordance with DA Form 12-25A, Direct and General Support Maintenance Requirements for Surveying. * U.S.
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