Operating instructions

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Part No. OS3-304

MTR-90III

MASTER TAPE RECORDER

OPERATION AND MAINTENANCE MANUAL

FOURTH EDITION

Printed: September 1996

Ed. 4 (GK)

Summary of content (162 pages)

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Part No. OS3-304 MTR-90III MASTER TAPE RECORDER OPERATION AND MAINTENANCE MANUAL FOURTH EDITION Printed: September 1996 Ed.
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CAUTION To prevent fire or shock hazard: Do not expose this unit to rain or moisture. Do not remove panels (unless instructed to do so). There are no user-serviceable parts inside. Refer servicing to qualified service personnel. PLEASE READ THROUGH THE SAFETY INSTRUCTIONS ON THE NEXT PAGE.
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SAFETY INSTRUCTIONS 1. Read Instructions All safety and operating instructions should be read before the device is operated. 2. Retain Instructions The safety and operating instructions should be retained for future reference. 3. Heed Warnings All warnings on the device and in the operating instructions should be complied with. 4. Follow Instructions All operating and use instructions should be followed. 5.
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COMMUNICATION WITH OTARI FOR SERVICE INFORMATION AND PARTS All Otari products are manufactured under strict quality control. Each unit is carefully inspected and tested prior to shipment. If, however, some adjustment or technical support becomes necessary, replacement parts are required, or technical questions arise, please contact your Otari dealer or contact Otari at: Otari, Inc.
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Table of Contents Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv Communication with Otari . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v Section 1 Introduction 1.1 The Otari MTR-90III Tape Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Table of Contents MTR-90III Operation and Maintenance Manual 4.2.8.2 Fast Cue Mode (Lifter Defeat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 4.2.9 Spot Erasure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 4.2.10 Variable Speed Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 4.2.11 External Speed Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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MTR-90III Operation and Maintenance Manual Table of Contents 6.1.4 Fast Forward/Rewind Damping Solenoid Adjustment . . . . . . . . . . . . . . 6-7 6.1.5 Swing Arm Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8 6.1.6 Tape Lifter Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8 6.1.7 Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Table of Contents MTR-90III Operation and Maintenance Manual 8.11 PB-4APA Master CPU P.C.B. Assembly . . . . . . . . . . . . . . . . . . . . . . 8-18 8.12 PB-45YA I/O Control P.C.B. Assembly . . . . . . . . . . . . . . . . . . . . . . . . 8-21 8.13 PB-45Z Tape Counter P.C.B. Assembly . . . . . . . . . . . . . . . . . . . . . . . 8-22 8.14 PB-4HQB Reel Control P.C.B. Assembly . . . . . . . . . . . . . . . . . . . . . 8-25 8.15 PB-62G Power P.C.B. Assembly . . . . . . . . . . . . . . . . . . . . . . . . . .
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List of Figures April 1992 Figure 2-1 SW1 on the TRANSPORT CONTROL PCA . . . . . . . . . . . . . . . 2-2 2-2 Controls on the BIAS CONTROL PCA . . . . . . . . . . . . . . . . . . . 2-3 2-3 Assembling the Mounting Flanges . . . . . . . . . . . . . . . . . . . . . . 2-6 2-4 Attaching the Stand Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 2-5 Assembling Auto Locator and Remote Control Unit . . . . . 2-7 2-6 Desk Top Stand Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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List of Tables April 1992 Table 2-1 SW1 on the TRANSPORT CONTROL PCA . . . . . . . . . . . . . . . 2-2 2-2 SW2 and SW3 on the TRANSPORT CONTROL PCA . . . . . 2-3 2-3 Reproduce EQ Selection: BIAS CONTROL PCA . . . . . . . . . 2-3 2-4 Cue Level Attenuation Selector: BIAS CONTROL PCA . . . 2-4 2-5 NR Remote Connector Pin Assignments . . . . . . . . . . . . . . 2-11 2-6 Jumper Switch Settings on EXT CONNECTION PCA . . . . 2-11 2-7 EXT. CLOCK Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . .
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Section 1 Introduction This section introduces the MTR-90III Tape Recorder and explains the different parts of this manual. 1.1 The Otari MTR-90III Tape Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.1 Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.
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Section 1 Introduction MTR-90III Operation and Maintenance Manual 1.1 The Otari MTR-90III Tape Recorder The Otari MTR-90III records and reproduces 1" or 2" master tapes in an 8-track, 16-track or 24-track format according to the head assembly and the number of Audio PCB Assemblies. Tension is distributed uniformly across the tape surface by a pair of wide diameter pinchrollerless spindles, the capstan and the tachometer.
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MTR-90III Operation and Maintenance Manual Section 1 Introduction The optional CB-148 Auto Locator with a built-in stop watch attaches to the same stand as the CB-147 and provides independent readouts and controls for the elapsed tape time and locate time. The locator also features zero cue, 10 keyboard assignable memories (keyboard or direct tape time memories) with direct recall, a shuttle function for repeating any desired segment of the tape, and other time saving functions.
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Section 1 Introduction MTR-90III Operation and Maintenance Manual SECTION 9 Exploded Views and Parts Lists: This section of the manual contains assembly drawings of the machine "exploded" to show internal parts and hardware, and the order of assembly. Each exploded view is keyed to an accompanying parts list showing Otari part numbers and descriptions for all mechanical components. 1.2.
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Section 2 Installation Most MTR-90III units are unpacked and tested by local Otari dealers making the following unpacking and checkout procedures unnecessary. The MTR-90III Recorder, CB-147 Remote Control Unit, logic and power cables, brackets and other related items are shipped partially assembled. Open the crates carefully and save packing materials at least until proper operation has been verified.
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Section 2 Installation MTR-90III Operation and Maintenance Manual 2.1 Inspection Before making any electrical connections, the equipment should be inspected visually. If there is any evidence of damage due to rough handling in shipping, it is the responsibility of the customer to notify the carrier and submit a claim. Do not connect or attempt to use the MTR-90III or accessories until this inspection has been made. 1.
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MTR-90III Operation and Maintenance Manual Section 2 Installation Table 2-1 SW1 on the TRANSPORT CONTROL PCA SWITCH FUNCTION EFFECT SW1-1 Hand Cueing Capstan SW1-2 SW1-3 SW1-4 Stop Stand-by Fast Wind Stand-by Play Start Inhibit ON: Defeats Stop Stand-by input switching, allowing audio to be monitored while hand cueing in Stop mode. OFF: Audio output stays in Input mode while in Stop if SW1-2 is on. ON: Switches to Input monitor in Stop mode. ON: Switches to Input monitor in Fast Wind mode.
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Section 2 Installation MTR-90III Operation and Maintenance Manual Table 2-4 Cue Level Attenuation Selector: BIAS CONTROL PCA SWITCH POSITION TAPE SPEED AUDIO EFFECT AT WIND SPEEDS SW4 ON SW4 OFF 15/30 ips 15/30 ips Not Changed Attenuated F. All cards should be firmly seated in their mating connectors and in the correct locations. G. Close the doors to the card cages. 3. From the front of the machine, check the connectors and components beneath the MTR-90III transport. A.
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MTR-90III Operation and Maintenance Manual Section 2 Installation C. Check the following connectors to be sure they are firmly mated. ❑ The many connectors located on the back of the upper card cage mother board. ❑ On the top panel there are three motor drive transistor assemblies. Each assembly has two large connectors and three small connectors. Check these connectors. D. The SMPTE-CUE slide switch on the left side of the upper card cage mother board should be set to the "OFF" position.
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Section 2 Installation MTR-90III Operation and Maintenance Manual 2.2 Assembly of Remote Control Unit The Remote Control Unit is provided with a stand for desk top use. The Remote Control Unit can be fitted with the angle adjusting knob for use at any convenient position. Refer to Figures 2-3 and 2-4. ❑ Attaching the ZA-52J Stand Assembly 1. Remove the two sections of the stand. 2. Assemble the ZA-52J Stand Assembly (Figures 2-3 and 2-4). 3.
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MTR-90III Operation and Maintenance Manual Section 2 Installation 2.3 Stand Assembly (for Remote Control Unit and Auto Locator) Refer to Figure 2-5 for the following instructions. 1. Remove the four pieces on the side of the Remote Control Unit. 2. Place the CB-147 Remote Control Unit panel upright on a flat work surface. Connectors should be facing away. 3. Locate the two large aluminum V-brackets. Using 3 allen head cap screws per bracket, attach one V-bracket to each side of the Remote Control Unit.
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Section 2 Installation MTR-90III Operation and Maintenance Manual 9. Insert the threaded screw of each knurled knob through the bearing flange and carrier block and screw it into the mounting flange, but do not tighten. 10. Notice that the carrier blocks are flat on one edge. The carrier blocks should be rotated so that the flat edge faces forward, mid-way between the front panels of the Remote Control Unit and Auto Locator. Refer to Figure 2-6 or 2-7. Tighten the knurled knobs.
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MTR-90III Operation and Maintenance Manual Section 2 Installation 2.4 Connections Before connecting cables to the MTR-90III, it is recommend that the 2 rubber bumpers supplied be screwed into two of the 4 corners of the chassis on the rear of the machine (the corners chosen depend on the specific installation). The bumpers help guard cable connectors from inadvertent damage. 2.4.1 Cable Connections 1.
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Section 2 Installation MTR-90III Operation and Maintenance Manual ❑ Logic cable for optional auto locator: (50-pin Cannon D connectors). Insert the male end of this cable into the MTR-90III and the female end into the Auto Locator. Then secure with the two screws supplied. NOTE: This cable is supplied with the optional CB-148 Auto Locator. ❑ AC power cord: (3-pin mains plug plus threaded 3-pin female connector).
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MTR-90III Operation and Maintenance Manual Section 2 Installation 2.4.2 NR Remote Connector When using Noise Reduction equipment, it can be automatically or remotely switched by means of a 50-pin Amp. connector on the MTR-90III (mates with AMPHENOL 57 series 50p plug or equivalent). See Table 2-5 for pin assignment of this logic connector. Relay contacts only are provided. No positive, negative or ground logic conditions are connected to these relay contacts.
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Section 2 Installation MTR-90III Operation and Maintenance Manual Table 2-7 EXT. CLOCK Pin Assignments Pin No. Function Pin No. Function 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. REC TALLY PLAY TALLY STOP TALLY FF TALLY RWD TALLY LIFTER DEFEAT SMPTE CUE SPD REF. VOLT. SPD COM. REC SWITCH PLAY SWITCH STOP SWITCH FF SWITCH 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. RWD SWITCH TACHO OUT 9.6K REF. GND EXT CLOCK (9.6 kHz nominal) CAPSTAN TACHO OUT +5V (150 mA) FWD/REV (Tape Direction) N.C. N.C. N.
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MTR-90III Operation and Maintenance Manual Section 2 Installation 2.4.5 Parallel I/O Connector The Otari Standard Parallel I/O Connector is used for connection with external controlling devices. Table 2-10 Parallel I/O Connector Pin Assignments No Function 1. 2. 3. 4. 5. 6. 9. 10. 11. 12. 13. 14. 16. 17. 18. 19. 20. 21. 22. 28. 29. 30. 32. 33. 34. 35. 36. 37.
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Section 2 Installation MTR-90III Operation and Maintenance Manual 2.5 Power Supply Conversion ❑ Voltage Conversion When the machine is used at a different voltage, the connection plug for the power supply needs to be rewired. To change the wiring, remove the bottom section of the back panel to expose the voltage selector plug (white nylon connector) to the “L” bracket on top of the right chassis frame.
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Section 3 Controls and Indicators This section describes the controls, indicators and connectors on the MTR-90III Tape Recorders, the CB-147 Remote Control Unit and on the optional CB-148 Auto Locator. 3.1 Transport Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3.2 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 3.3 Remote Control Unit (CB-147) . . . . . . . . . . . . . . . . . . .
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Section 3 Controls and Indicators MTR-90III Operation and Maintenance Manual 3.1 Transport Controls and Indicators 2 1 TAPE SPEED 3 RESET HI LOW UNLOAD SPOT ERASE 4 5 CUE 6 7 Figure 3-1 MTR-90III Transport Features and Controls SHIELD 8 9 11 10 13 12 14 NOTE: Numbers in brackets [ ] refer to Figure 3-1. The transport buttons glow dimly while power is on. When power is first turned on, the UNLOAD button [4] is brighter than the other buttons.
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MTR-90III Operation and Maintenance Manual Section 3 Controls and Indicators [5] SPOT ERASE Button This button is used to erase unwanted tracks. Refer to §4.2.9 for a detailed description on using the Spot Erase mode. [6] Cue Wheel/Indicators The Cue Wheel controls the direction and speed of tape motion in Cue mode. The indicators show the direction of tape motion. (See [7] CUE Button for further explanation.) [7] CUE Button The button is used to enter Cue Mode. When pressed, it illuminates brightly.
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Section 3 Controls and Indicators [12] STOP Button MTR-90III Operation and Maintenance Manual This button is used to stop tape motion. ❑ Exiting Record Mode: Press this button to exit Record mode and stop the tape. ❑ Loading: Press this button when slack is present in the tape path (after unloading or when threading the tape) to activate the servos. The STOP button illuminates. [13] Rewind (RWD) Button This button is used to wind the tape from Take-up reel to Supply reel at Fast Wind speed (Rewind).
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MTR-90III Operation and Maintenance Manual Section 3 Controls and Indicators 3.2 Rear Panel 1 NR REMOTE AMP REMOTE 13 - 24CH 2 AMP REMOTE 1 - 12CH INPUT CH24 CH23 CH22 CH21 CH20 CH19 CH18 CH17 CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9 CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1 3 OUTPUT EXT CLOCK PARALLEL 1/0 SERIAL 1/0 REMOTE AUTO LOCATOR POWER GROUND 7 5 4 6 8 10 9 Figure 3-2 Rear Panel Features NOTE: Numbers in brackets [ ] refer to Figure 3-2.
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Section 3 Controls and Indicators MTR-90III Operation and Maintenance Manual [5] PARALLEL I/O Connector This is a standard Otari parallel I/O interface connector. [6] SERIAL I/O Connector These connectors provide serial remote control of transport and audio channel modes. [7] REMOTE Connector This connector is used for Remote Controllers (e.g., CB-147). [8] AUTO LOCATOR Connector This connector is used for the CB-148 Auto Locator.
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MTR-90III Operation and Maintenance Manual Section 3 Controls and Indicators 3.3 Remote Control Unit (CB-147) 11 ALL SAFE 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 READY SAFE 9 ALL INPUT ALL SEL-REP ALL REPRO 7 INDIVIDUAL INPUT 8 SEL-REP REPRO 6 VARI FIX EXT SPEED DISPLAY PITCH CONTROL HI IPS LO % DOWN CUE RECORD PLAY STOP CB-147 5 4 3 RWD F.
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Section 3 Controls and Indicators [7] INDIVIDUAL Button MTR-90III Operation and Maintenance Manual ❑ VARI Mode: The capstan speed can be varied through a range of just over ±20%, almost four musical steps, as set by the adjacent PITCH CONTROL knob [2]. The speed variation is indicated on the Speed Display screen [4] in percent or ips. The SPEED DISPLAY button [5] must be pushed to view this variation. The speed is varied from the speed set by the TAPE SPEED button (§3.1, [2]) on the MTR-90III.
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MTR-90III Operation and Maintenance Manual [10] READY/SAFE Switches/Indicators Section 3 Controls and Indicators These 2-position switches are provided for setting individual channels in Record Ready or Record Safe mode. The red indicators above illuminate when that READY/SAFE switch is set to READY, indicating that the corresponding channel is ready for recording. The READY/SAFE switches can be overridden by the ALL SAFE switch [11].
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Section 3 Controls and Indicators MTR-90III Operation and Maintenance Manual 3.4 Auto Locator (CB-148) 1 2 TAPE TIME LOCATE TIME STOP WATCH RESET H 0 M 1 RESET S 2 3 19 H 3 4 5 6 M 7 RESET ALL CLEAR S 8 18 M S STOP START/LAP 9 STORE 4 17 SEARCH 7 8 9 SEARCH ZERO ZERO SET RECORD SEARCH PLAY SHUTTLE STOP REW AUTO REWIND 4 5 6 F.
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MTR-90III Operation and Maintenance Manual Section 3 Controls and Indicators [2] LOCATE TIME (Locate Time Readout/RESET Button) The Locate Time readout displays the tape time destination when the SEARCH [14], SHUTTLE [13], or AUTO REWIND [12] buttons have been pressed. The Locate Time readout is also provided with a minus sign at the head of digital readouts when the elapsed time diminishes from 0.00.00, that is, just before 0.00.00, -0.00.00 is displayed.
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Section 3 Controls and Indicators [7] SHIFT RIGHT Button ( ) MTR-90III Operation and Maintenance Manual This button transfers the time shown on the Tape Time readout [1] to the Locate Time readout [2]. NOTE: Tape Time can be stored “on the fly” while the tape is playing or recording by pressing SHIFT RIGHT at the exact instant to be recorded and then pressing STO followed by a numeric address.
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MTR-90III Operation and Maintenance Manual [13] SHUTTLE Button Section 3 Controls and Indicators Pressing the SHUTTLE button causes the MTR-90III to “remember” the current Tape Time displayed on the readout and to enter (or continue in) Play mode until the Locate Time is reached. Then the tape automatically rewinds to the point where SHUTTLE was first pressed and plays again. This cycle continues until Shuttle mode is exited.
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Section 3 Controls and Indicators [15] SEARCH ZERO Button MTR-90III Operation and Maintenance Manual Pressing the SEARCH ZERO button causes the MTR-90III to return at fast wind (or rewind) speed to the 0.00.00 Tape Time shown on the MTR-90III Tape Time readout. There are three variations of Search Zero Mode. NOTE: If the Auto locator Tape Time readout has been changed to a different zero from the MTR-90III, it will reset to match the MTR-90III the moment SEARCH ZERO is pressed.
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Section 4 Operation This section contains a list and an accompanying explanation of each of the operating conditions (or modes) of the MTR-90III and detailed instructions describing each mode of operation. All portions of this section should be read when first becoming familiar with the machine and then again as a guide while learning to operate the machine. The Table of Operating Modes provides a quick reference, and the detailed portion provides in depth instructions about how to operate the machine.
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Section 4 Operation MTR-90III Operation and Maintenance Manual 4.1 Modes of Operation CAUTION: The reel motor on the MTR-90III supplies a powerful torque force. When a tape is threaded on the machine, do not touch the reel or tension arm. When the machine is in Fast Wind mode, exercise caution to keep hair, clothing, jewelry, fingers, etc., away from the reel. When the operations are controlled from the Remote Control, precautionary measures are important.
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MTR-90III Operation and Maintenance Manual Section 4 Operation 4.2 Record and Play Modes If there are any unusual sounds, mechanical malfunctions or strange odors during the following procedures or if anything seems to be abnormal, immediately turn off the POWER switch, unplug the AC cord and inspect the machine to determine the cause.
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Section 4 Operation MTR-90III Operation and Maintenance Manual 4. Pull about 120 cm (4') of tape from the reel and thread along the tape path shown in Figure 4-1 (also imprinted on the MTR-90III deck plate near the transport buttons). Wind the tape 2 or 3 time around the empty reel, make sure the tape does not slip and is wound firmly. Do not fold the end of the tape as the bump created will disrupt the constant servo tension and create unnecessary swing arm jitter (vibration). 5.
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MTR-90III Operation and Maintenance Manual Section 4 Operation 4.2.3 Playback of Initial Tracks 1. Rewind the tape to the beginning of the recording by pressing SEARCH ZERO on the Auto Locator (if the Tape Timer was reset at the beginning of the recording session) or by pressing the REWIND button. 2. Set the ALL SAFE switch on the Remote Control Unit to the ALL SAFE position to avoid accidentally erasing recorded tracks. The ALL SAFE indicator will become illuminated. 3.
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Section 4 Operation MTR-90III Operation and Maintenance Manual 4.2.5 Sel·Rep Recording (Punch-Ins) Punch-ins are performed when it is necessary to insert new material into a track that has already been recorded without recording the entire track again. Punch-ins allow monitoring of previously recorded material on the tracks selected for recording, right up to the instant the track is put into Record.
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MTR-90III Operation and Maintenance Manual Section 4 Operation 4.2.6 Rehearsal of Overdubs and Punch-Ins For the overdub and punch-in procedures discussed in § 4.2.4 and § 4.2.5 there was no way to monitor the new input signal unless and until the machine was recording. It may be desirable to do "dry runs" (i.e., rehearse the overdub or punch-in) by playing previously recorded tracks through the record head and sync amps and by monitoring the input of the tracks to be recorded. 4.2.6.
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Section 4 Operation MTR-90III Operation and Maintenance Manual 4.2.7 Mixdown The procedure for mixdown is the same as for playback of the initial tracks (§ 4.2.3). Be sure to use the reproduce head (Repro mode) rather than the record head (Sel·Rep mode) for best quality. 4.2.8 Cue Modes 4.2.8.1 Normal Cue Mode When the machine is in Stop mode, pressing the CUE button on the MTR-90III (not on the Remote Control Unit) activates the adjacent Cue Wheel.
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MTR-90III Operation and Maintenance Manual Section 4 Operation 4.2.9 Spot Erasure The Spot Erase function is available for erasing short lengths of unwanted tracks. 1. Search for the portion of tape to be erased in Cue mode or by rotating the top of the capstan motor by hand. 2. Mark the beginning and the end of the portion of the tape to be erased with a grease pen. 3. Press the STOP button. 4. Set the READY/SAFE switch to the READY position for the channel to be erased. Set all other channels to SAFE.
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Section 4 Operation MTR-90III Operation and Maintenance Manual 4.2.11 External Speed Reference An external clock (reference oscillator) can be used to control the speed of the MTR-90III capstan motor. When the SPEED MODE switch is set to EXT position, a suitable input signal must be applied to P/N18 of the EXT CLOCK input connector (a 25 pin Honda connector on the MTR-90III rear panel) or P/N20 of the Parallel I/O Connector (37 pin connector on the MTR-90III rear panel).
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MTR-90III Operation and Maintenance Manual Section 4 Operation 4.3 Auto Locator Operation The OTARI CB-148 Auto Locator is designed specifically for the MTR-90III. It uses a microcomputer for sophisticated, precision control of tape motion without overshoot. The tape time memory stores up to 10 cue points (11 if search zero is also considered) which can be directly memorized by pressing only one button instead of being keyed in and can be directly recalled instantly by pressing another button.
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Section 4 Operation MTR-90III Operation and Maintenance Manual ❑ Storing with the STO Button and the 10-Key Pad: The STO button is used to memorize the time displayed in the Locate Time readout. Up to ten different times can be stored at once. Memory is volatile, meaning it is not saved after the power is turned off. 1. To store a given cue, display the desired cue point time in the Locate Time readout (refer to § 4.3.1). 2.
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MTR-90III Operation and Maintenance Manual Section 4 Operation 4.3.5 Search There are two ways to search for cue points. When Search mode is initiated, the tape fast winds to the location displayed on the Locate Time readout or to the tape time stored in the Auto Locator memory. When using the SEARCH button and the 10-Key Pad, it is possible to initiate Search/Play or Search/Record.
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Section 4 Operation MTR-90III Operation and Maintenance Manual 4.3.6 Search Zero Pressing the SEARCH ZERO button causes the MTR-90III to return at fast wind speed to the 0.00.00 Tape Time shown on the MTR-90III Tape Time readout. There are three variations of Search Zero Mode. NOTE: If the Auto locator Tape Time readout has been changed to a different zero from the MTR-90III, it will reset to match the MTR-90III the moment SEARCH ZERO is pressed.
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MTR-90III Operation and Maintenance Manual Section 4 Operation 4.3.7 Shuttle The Shuttle mode allows for continuous playback of a section of tape. Shuttle mode is helpful for playing a section of an alignment tape, for rehearsing a particular segment of a tune, and so forth. NOTE: If the Locate Time is not greater than the displayed Tape Time, the SHUTTLE will enter Reverse Shuttle mode.
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Section 4 Operation MTR-90III Operation and Maintenance Manual 4.3.9 Setting the Tape Time Readout (Offset Mode) The Tape Time readout displays the elapsed time of the tape relative to the same zero point shown on the MTR-90III readout or any other point on the tape such as the beginning of a take. The Tape Time readout setting can be changed in various ways: to match the Tape Time Counter Display, to match the Locate Time readout, or to read zero.
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Section 5 Maintenance The OTARI MTR-90III requires very little maintenance other than routine electronic alignment to different tape batches, cleaning, and demagnetization. In addition to these day-to-day maintenance procedures, there are a few items that will benefit from occasional cleaning and/or lubrication. Such items, plus a few parts replacement procedures, are covered in this section of the manual. When first performing these procedures, proceed slowly and carefully.
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Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.1 Demagnetizing and Cleaning the Tape Path The following items are necessary to perform the maintenance procedures outlined in this section. ❑ A head demagnetizer (degausser). ❑ Pure isopropyl alcohol for head cleaning. ❑ Lint-free cloth and cotton swabs. CAUTION: Do not use rubbing alcohol as it can leave water and oil residues. Do not use other solvents as they may delaminate the heads. 5.1.
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MTR-90III Operation and Maintenance Manual Section 5 Maintenance 6. Working from left to right, repeat steps 3,4, and 5 for each additional metallic part in the tape path: A. B. C. D. E. F. Tachometer idler Guide roller (Supply) Tape lifter (left) Erase head Record head Scrape flutter filter roller G. H. I. J. K. Tape lifter (right) Reproduce head Guide roller (Take-up) Capstan idler Take-up swing arm roller 7.
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Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.1.3 Cleaning the Head Shield Screw Perform this procedure once every 6 months or if the shields should become noisy or move erratically. 1. Turn the power off and open the VU Meter Panel. 2. Using a lint-free cloth, wipe off the screw (worm) shaft in the center of the head shield mechanism and the two smaller guide shafts on either side of that screw (Figure 5-1).
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MTR-90III Operation and Maintenance Manual Section 5 Maintenance 5.2 Routine Maintenance This section covers routine maintenance procedures and a few parts replacement procedures. See Section 6 for procedures on Alignments. 5.2.1 Removing and Reinserting the Printed Circuit Boards The PCB Assemblies in the upper and lower card cages are equipped with convenient levers that uniformly distribute pressure when withdrawing the cards.
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Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.2.3 Reel Motor Replacement 1. Turn the power off and unplug the AC power cable. 2. Remove the guard ring around the reel turntable of the motor to be replaced and then loosen the two recessed allen screws in the turntable hub and lift it off the motor shaft. Refer to Figure 5-2. 3. Remove the four phillips screws that secure the upper back panel of the chassis and fold the chassis down carefully. 4.
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MTR-90III Operation and Maintenance Manual Section 5 Maintenance 5.2.4 Brake Band Replacement Brake bands receive very little wear and seldom require replacement. If a band does wear out, perform the following procedure. 1. Turn off the power. Open the VU Meter Panel. Open the Transport. 2. Remove the Tachometer and its cover from the Brake Assembly. 3. Remove the four screws behind the brake arms that secure the brake band marked in Figure 5-3 with black arrows.. Remove the brake pad. 4.
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Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.2.5 VU Meter Lamp Replacement The VU meter lamps are operated at less than their rated voltage and should have a very long life. If a lamp does burn out, replacement lamps are available from OTARI (Otari Part No. LU2070). 1. Turn off the power. Open the VU Meter Panel. 2. Locate the meter that needs a replacement lamp. Loosen the screw indicated in Figure 5-4. Turn or remove the metal plate. 3. Remove the old meter lamp with tweezers.
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MTR-90III Operation and Maintenance Manual Section 5 Maintenance 5.3 Circuit Descriptions Pertinent schematic diagrams in the drawing package accompanying this manual are referred to after each subtitle alternate drawing numbers are also given in parenthesis( ). Each circuit board has its own individual power supply regulation to provide the necessary voltages. 5.3.1 Playback Head and Preamp PB-16KOA (PB9A577) The playback (repro) head has a high impedance output (2 kΩ at 1 kHz).
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Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.3.5 Output Stage PB-16KOA (PB9A577) Three FETs select the signal source to the output amplifier: the repro head (Q120), sync repro (Q122), or the input to the record electronics (Q118). The logic-selected signal is fed to the first stage of a dual Op Amp (Operational Amplifier) (IC103A) and then to a bias trap, the second half of the Op Amp (IC102B) and another bias trap. The output of the second bias trap is fed to an Op Amp (IC104).
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MTR-90III Operation and Maintenance Manual Section 5 Maintenance 5.3.7 Audio/Bias Mixing Circuitry PB-16KOA (PB9A577) A master bias signal is generated on the Bias Control board and distributed to each channel's electronics, where it is amplified and mixed with the preconditioned audio input. A 10-turn 1- kΩ potentiometer (VR301) serves as the channel's Bias Level adjustment. The bias current is applied to IC301, the amplification stage, through R301 and C302. L301 and C301 are wave shapers.
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Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.3.9 Reel Control Board PB-4QHB (PB9B266) As a system, the Reel Control board, swing arm potentiometers, motor drive amp output, and reel motors, all maintain constant the tape tension. In addition, the Reel Control board senses whether the swing arms are in the correct position to allow arming of the reel servos, or in a position that would require disarming of the servos. (Refer to the upper left hand corner of the schematic.
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Section 6 Alignment This section contains information necessary when performing the routine maintenance and occasional adjustment procedures necessary to keep the MTR-90III in peak operating condition. Many adjustments are seldom, if ever, necessary, such as those for the brakes, tape lifters, and servos. Other adjustments, such as head azimuth, will be necessary when playing tapes made on other machines.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1 Transport Alignment To make these adjustments, the following items are necessary: ❑ A suitable test tape, preferably 320 nanoWebers per meter (nWb/m) reference level. The tape should be compatible with the head format (i.e., 8, 16 or 24 track). ❑ A test oscillator capable of generating the following frequencies: 125 Hz, 700 Hz or 1 kHz, 10 kHz, and 15 kHz at +4 dBu or the standard operating level for the studio.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment TRANSPORT DECK PLATE REEL GUARD RINGS HEAD ASSEMBLY COVER TAPE SPEED RESET HI LOW TAPE PLATE UNLOAD SPOT ERASE CUE SHIELD Figure 6-1 Transport Deck Plate Removal 6.1.1.2 Removing the Transport Deck Plate Refer to Figure 6-1 for the following instructions. The screws to be removed are indicated with black arrows. 1. Turn off the MTR-90III POWER switch. 2.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.1.3 Reinstalling the Transport Deck Plate Reinstall the Transport Deck Plate by installing the parts in the reverse order of § 6.1.1.2. ❑ Make sure no loose parts, tools, wires, etc. have been left on the Transport Deck Plate. ❑ When reinstalling the head assembly base, be sure not to scrape the tacho roller or capstan roller with the edges of the base.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.1.2.1 Reproduce Head Azimuth Reproduce Head Azimuth adjustment should be performed before Record Head Azimuth adjustment. 1. Place a test tape on the transport and connect a dual-trace oscilloscope to the outputs for CH 2 and CH 23 (or CH 2 and CH 15 on the 16 track head assembly, CH 2 and CH 7 on the 8 track head assembly). 2. Set the Transport to All Repro mode on the Remote Control Unit. 3.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.3 Swing Arm Travel These adjustments should be checked and performed after every 6 months of heavy machine use or whenever a swing arm component has been damaged or replaced. The two L-brackets on the linkage of each swing arm restrict swing arm travel when they contact a rubber-padded post screwed to the deck plate.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.1.4 Fast Forward/Rewind Damping Solenoid Adjustment The Fast Forward/Rewind damping solenoid can be moved back and forth after loosening the four phillips screws beneath the deck plate. Repeat the following procedure for the Supply and Take-up sides of the transport. 1. Turn off the power to the machine. 2.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.5 Swing Arm Adjustment When the power is on and the swing arm solenoids have been activated, the swing arm tension is solenoid controlled only in Fast Forward and Rewind modes. The tension of the coil springs on each swing arm should be checked periodically and adjusted as required to maintain accurate functioning. Repeat the following procedure for the Supply and Take-up sides of the transport. Refer to Figure 6-3. 1.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment LIFTER SOLENOID ADJUSTMENT SCREWS FOR "L" BRACKET ON LINKAGE (LIFTER IN RESTING POSITION) AIRPOT LINKAGE TO OTHER TAPE LIFTER ASSEMBLY (THIS PROCEDURE ADJUST BOTH LIFTERS AT THE SAME TIME) LIFTER PIN Figure 6-5 Tape Lifter Adjustment NOTE: Components shown are an "x-ray" view, i.e., as though seen looking down on top of the deck plate.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.7 Brakes Braking is accomplished primarily through the servo control of the reel motors. As a safety backup in case of power failure, mechanical brakes have been provided. A padded felt band is spring loaded against a brake drum attached to the reel motor shaft. The felt band is held away from the brake drum during Play, Record, Fast Forward, and Rewind modes. Only during Unload mode and when the power is off, do the brakes engage.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment NOTE: This adjustment is not critical to the performance to the machine. A 150-200 gram difference in tension between the Supply and Take-up sides is acceptable for balanced braking in case of a power failure. 5. If the tension is not within acceptable limits, loosen the tension bracket locking screw and adjust the tension adjustment nut on each brake assembly.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.9 Reel Tension Servo Adjustments Before these adjustments can be performed, the swing arm adjustments and/or voltage measurements should be checked. Refer to § 6.1.5. 6.1.9.1 Upper and Lower Limit Adjustment of Reel Tension Steps 2 and 3 are necessary only if either or both tension arm assemblies have been disassembled. T.UP POS GAIN L M H UPPER LOWER SUP POS GAIN L M H UPPER LOWER REEL CONTROL 1. Turn the power off.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.1.9.2 Preliminary Center Position and Gain Adjustments Before performing these adjustments, the Swing Arm Travel adjustments should be performed as described in § 6.1.3. This method of adjustment requires a digital voltmeter but needs no tape on the machine. Remove any tape and/or reels. 1. Turn off the machine and extend the REEL CONTROL PCB Assembly.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.9.4 Reel Motor Tracking with Capstan The potentiometers for adjusting the motor tracking torques are located on the TRANSPORT CONTROL PCB Assembly. 1. Turn off the power to the machine, and extend the TRANSPORT CONTROL PCB Assembly with the EXTENSION PCB Assembly. 2. Turn on the power and thread a 10.5 inch reel of tape onto the transport and wind until the tape is evenly distributed between the Take-up and Supply reels.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.1.9.5 Fine Adjustment of Position and Gain 1. Turn on the power and place the machine in Rewind mode. If there is any slippage of the tape on the capstan roller, adjust the SUP POS trimmer on the REEL CONTROL PCB Assembly by turning it slowly counterclockwise until the slippage is eliminated (Figure 6-9). Wind time for a 10.5 inch reel (2500 feet) of 2.0 mil tape should be approximately 85 seconds (1 minute 25 seconds).
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.10 Capstan Servo Adjustments NOTE: Refer to the following illustrations: Figure 6-11 for Capstan Tachometer Adjustment Figure 6-12 for CAPSTAN CONTROL PCB Assemblies Adjustments 6.1.10.1 Capstan Tachometer Adjustment 1. Turn off power to the machine. Extend the CAPSTAN CONTROL PCB Assembly (board #2). Turn on the power. 2.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.1.10.2 Adjustment of CAPSTAN CONTROL PCB Assembly 1. Turn off power to the machine and extend the CAPSTAN CONTROL PCB Assembly. 2. Engage the reel servo system by threading the machine with tape. 3. Put the machine into Play mode. 4. Stop the machine. Adjust VR6 for 0 Volt at TP10. 5. Connect a dual-trace oscilloscope to TP1 and TP3 on the CAPSTAN CONTROL PCB Assembly. Turn the power on. 6.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 8. Put the machine into Fast Forward or Rewind and adjust VR1 FAST SPEED on the I/O CONTROL PCB Assembly (front panel) to obtain a frequency reading of 64 kHz. NOTE: If VR1 is left fully clockwise, a time delay will occur when going from fast wind modes to other modes of operation. 9. Wind the tape until there is an equal amount of tape on the Supply and Take-up reels. Check the Fast Forward and Rewind frequencies.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.1.11 Adjustment of TRANSPORT CONTROL PCB Assembly Refer to "Reel Motor Tracking with Capstan" § 6.1.9.4 for the procedure on adjusting VR1 and VR2. 6.1.12 Adjustment of MASTER CPU PCB Assembly 1. Turn off the power to the machine and extend the MASTER CPU PCB Assembly. 2. Connect the Remote Control Unit to the tape machine. On the Remote Control Unit select Vari speed mode and speed indication in percent. 3.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.2 Audio Alignment 6.2.1 Reproduce Amp Alignment 1. Check to make sure the LOW FREQ COMP switch on the BIAS CONTROL PCB Assembly (board #7 in the lower card cage) is in the OFF position. The LOW FREQ controls on the AUDIO PCB Assemblies are normally adjusted only in Record/Reproduce mode, unless the machine is being aligned to prerecorded alignment tones from a session at another studio. 2.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.2.2 Sync Amp Alignment 1. Engage the ALL SEL·REP button on the Remote Control Unit. ALL SAFE should still be engaged. REPRO GAIN 2. Rewind the test tape and locate and play the 1 kHz reference tone. 3. The VU meters should indicate 0 VU. If any do not, adjust the SYNC GAIN control on the corresponding AUDIO PCB Assembly as necessary (Figure 6-13.) HI SPD EQ LOW SPD EQ 4. Locate and play the 10 kHz tone on the alignment tape.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 10. Turn the BIAS control on the AUDIO PCB Assembly counterclockwise until the indication on the VU meter begins to drop. If the control is already fully counter-clockwise, turn the BIAS control clockwise until the indication on the VU meter peaks. Then continue clockwise rotation until the VU meter reading decreases (overbias). Refer to the BIAS CHART (Table 6-2) to determine the amount of overbias that is correct for your tape and speed.
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MTR-90III Operation and Maintenance Manual Section 6 Alignment 7. All the VU meters should now indicate 0 VU. If any do not, adjust the RECORD GAIN control on the corresponding AUDIO PCB Assembly as required (Figure 6-15). LOW FREQ REC GAIN 8. Switch the test or console oscillator to provide a 10 kHz signal at 0 VU to the inputs. PHASE 9. All the VU meters should now indicate 0 VU.
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Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.2.6 Erase Current Adjustment 1. Turn off the power to the machine. 2. Extend the BIAS CONTROL PCB Assembly (Board #7). 3. Turn on the power to the machine. 4. Use an oscilloscope to monitor the waveform at TP2 on the BIAS CONTROL PCB Assembly with the group lead of the scope connected to a GND test point on the PCB Assembly. 5. Adjust VR-4 on the BIAS CONTROL PCB Assembly for 5 V P-P waveform. 6. Turn off the power to the machine. 7.
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Erase Sig Input Bias Sig Line Input +4dBu Active Bal Line/Test Test Signal EQ AES/NAB/IEC Low Comp ON/OFF Reproduce Head – 85.
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PAGE 101
Section 7 Specifications 7.1 Tape Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 7.2 Electronics (Measured with AMPEX #456 Tape) . . . . . . . . . . . . . . 7-3 7.3 Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4 7.4 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Section 7 Specifications MTR-90III Operation and Maintenance Manual 7.1 Tape Transport Tape Width And Tracks 1-inch (25.4 mm) 8 tracks* 2-inch (50.8 mm) 16 tracks 2-inch (50.8 mm) 24 tracks Heads Plug-in head blocks with full access to independent head azimuth adjustment. Motors 1 DC capstan motor; 2 fully servoed DC reel motors. Reel Size Up to 14 inches diameter (35.63 cm) NAB hub with reel size auto sensing Tape Speed 30 ips (76.2 cm/s) and 15 ips (38.1 cm/s) 15 ips (38.1 cm/s) and 7.
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MTR-90III Operation and Maintenance Manual Section 7 Specifications 7.2 Electronics (Measured with AMPEX #456 Tape) Line Input Transformerless Active Balanced (Floating transformers are optional) Input Impedance: 10 kΩ (20 Hz to 20 kHz) Nominal Level: +4 dBu Connectors: XL-3 type, Female Line Output Transformerless Active Balanced (Floating transformers are optional) Output Impedance: 5 Ω (20 Hz to 20 kHz) Load impedance: min.
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Section 7 Specifications MTR-90III Operation and Maintenance Manual 7.3 Physical Weight approx. 200 kg (440 pounds) Dimensions 1,085 mm (H) X 770 mm (W) X 620 mm (D) [43" (H) X 30" (W) X 24-1/2" (D)] Finish Light beige and gray pebble finished steel chassis, black cover panels. Power Supply 100/117/220/240 V ±10% single phase AC, 50 Hz or 60 Hz Power Consumption Normal 1 kVA Max.
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MTR-90III Operation and Maintenance Manual Section 7 Specifications 7.
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Section 8 Printed Circuit Board Layouts and Parts Lists The following P.C.B. pattern layout drawings and parts lists are provided for service reference. Parts list includes only main parts or the parts difficult to obtain in the field. Also the lists include the parts which should be replaced with the exact same parts supplied by OTARI to maintain performance.
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Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.1 PB-16KA REC & REPRO Amplifier P.C.B. Assembly No. RV101 RV102 RV103 RV104 RV105 RV106 RV107 RV108 RV201 RV202 RV203 RV204 RV205 RV206 RV207 RV301 RV401 RL503 RL501 RL502 L401,L402 L301~L303 L201,L601~L602 L101~L103 C638, C639 SW101 T101 R399, R422 R421 R185, R186, R187, R188 TP1 TP2 8-2 Description Part No. Notes P.C.B.
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MTR-90III Operation and Maintenance Manual October 1990 Section 8 Printed Circuit Board Layouts and Parts Lists 8-3
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Section 8 Printed Circuit Board Layouts and Parts Lists 8-4 MTR-90III Operation and Maintenance Manual October 1990
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MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.2 PB-15L Bias Control P.C.B. Assembly No. VR1~VR3 VR4 VR5 C50 RL1 SW1 SW2 SW3, SW4 R121 April 1991 Description Part No. P.C.B. Potentiometer Potentiometer Potentiometer Jack Capacitor Heatsink Relay Switch Switch Switch Resistor PB9A465A RV414172 RV414207 RV414207 CN605062 C71R012M KZ1A028 RY4DC037 WH32003 WH32007 WH91023 R8CJ101M Notes BIAS ADJ. 10 kΩ ERASE ADJ.
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Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.3 PB-4PKA Reel Size Detect P.C.B. Assembly No. Description Reel Size Detect PCB Connector, Head Connector, Head Connector, Head Connector, Head Connector, Head Spring D2,D4,D5,D6,D9 Diode, 1S1585LB5 D1,D3,D7,D8 indicator, TLR124 X1 Crystal, 9.8304 MHz VR2 Potentiometer, 20 k VR1, VR3 Potentiometer, 50 k Holder, PCB SW1, SW2 Dip switch CN6 CN4 CN7 CN2 CN5 8-6 Part No.
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MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.4 PB-45MB Speed Calculate P.C.B. Assembly October 1990 No. Description Part No. Notes PB9A456B CN404053 CN403062 CN7B-053 CN406055 CN403064 IN19069 Bare Board Male 4P Female 4P L1 P.C.B.
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Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.5 PB-45R Hour Meter P.C.B. Assembly No. 8-8 Description Part No. P.C.B. Connector Connector Socket Contact Spring P.C.B.
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MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.6 PB-46A Capstan Photo Amplifier P.C.B. Assembly October 1990 No. Description Part No. VR101, VR102 P.C.B.
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Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.7 PB-45SB Reel Power TR P.C.B. Assembly No. D5~D12 R2, R12 R3, R13 R21 R4, R14 R7, R8, R9, R10, R17, R18, R19, R20, R211 Description Part No. Notes P.C.B.
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MTR-90III Operation and Maintenance Manual October 1990 Section 8 Printed Circuit Board Layouts and Parts Lists 8 - 11
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Section 8 Printed Circuit Board Layouts and Parts Lists 8 - 12 MTR-90III Operation and Maintenance Manual October 1990
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MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.8 PB-45T Capstan Power TR P.C.B. Assembly No. R2, R10 R3, R11 R17 R4, R12 R7,R8,R15,R16, Description Part No. Notes P.C.B.
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Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.9 PB-45V Capstan Control P.C.B. Assembly No. VR1 VR2 VR3 VR4 VR5 VR6 Description Part No. P.C.B.
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MTR-90III Operation and Maintenance Manual October 1990 Section 8 Printed Circuit Board Layouts and Parts Lists 8 - 15
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Section 8 Printed Circuit Board Layouts and Parts Lists 8 - 16 MTR-90III Operation and Maintenance Manual October 1990
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MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.10 PB-47AB Transport Control P.C.B. Assembly No. SW1, SW2 D9~D22 RV1, RV2 April 1991 Description Part No. P.C.B.
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Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.11 PB-4APA Master CPU P.C.B. Assembly No. D10 VR1 SW1 8 - 18 Description Part No. P.C.B.
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MTR-90III Operation and Maintenance Manual October 1990 Section 8 Printed Circuit Board Layouts and Parts Lists 8 - 19
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Section 8 Printed Circuit Board Layouts and Parts Lists 8 - 20 MTR-90III Operation and Maintenance Manual October 1990
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MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.12 PB-45YA I/O Control P.C.B. Assembly No. D11, D13, D14 VR1, VR3 VR6, VR7 VR5 VR2 April 1991 Description Part No. P.C.B.
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Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.13 PB-45Z Tape Counter P.C.B. Assembly No. C4 IC13 LAMP TEST 8 - 22 Description Part No. P.C.B.
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MTR-90III Operation and Maintenance Manual October 1990 Section 8 Printed Circuit Board Layouts and Parts Lists 8 - 23
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Section 8 Printed Circuit Board Layouts and Parts Lists 8 - 24 MTR-90III Operation and Maintenance Manual October 1990
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MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.14 PB-4HQB Reel Control P.C.B. Assembly No. D1,D2,D4~D8 D10~D12,D14~D20 D3, D13 D9,D21~D26,D31 D27, D29 D28, D30 VR9~VR12 VR4, VR8 VR2,VR3,VR6,VR7 VR1, VR5 RL1 R81, R89, R100 R107 R77, R96 R84, R103 R82, R83, R87 R101, R102, R106 R125, R126 TP1 TP2 TP3 TP4 TP5 TP6 TP7 TP8 October 1990 Description Part No.
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Section 9 Exploded Views and Parts Lists The following exploded view drawings and parts lists are provided for service reference. Parts list titles are followed by a key number, in brackets, which refers to the corresponding exploded view drawing number. For example, the parts list for the Head Assembly [1] is keyed to the first exploded view drawing. Notice that the reference number for the Head Housing (P/N KHOF043), is related to part designation number 1 on that drawing.
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Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.1 Head Assembly: KH-6K These key numbers which preceed the parts description refer to callouts in the exploded views. Each parts list is associated with one exploded view drawing, as indicated by the number in brackets after the parts list title. No. Description Part No.
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MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.2 Capstan/CNT Roller Assembly: KC-6E/KI-6E October 1990 No. Description Part No.
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Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.3 Tape Lifter/Shield Assembly: KR-6B/ZA-72S No. 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 36 37 38 39 Description Part No.
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MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.4 Tension Arm Assembly: KA-6H April 1991 No. Description Part No.
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Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.5 Reel Assembly: KW-6B 9 - 10 No. Description Part No.
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MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.6 Motor Drive Heatsink Assembly: ZA-94Y April 1992 No. Description Part No. 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 Panel, Rear Heatsink Panel, Side Edging Handle Fan, Cooling Guard, Fan Stud Angle, A Angle, B Hinge, R Hinge, L Stopper, B Stopper, A Transistor Transistor Sheet, Transistor Insulation Connector P.C.B.
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Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.7 Amp Chassis Assembly: 9 - 14 No. Description Part No. 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 Cover, Amp Chassis CB30902 Panel, Amp L Side K104602 Panel, Amp R Side K104601 Angle, Amp Rack K104607 Angle A, Amp Guide Rail K104605 Angle B, Amp Guide Rail K104606 P.C.B. Assembly, Record/Reproduce PB-16KA Panel, Amp Chassis Reinforcement K104608 Guide, P.C.
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MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.8 Control Panel Assembly/24CH VU meter Assembly: CB-24J/ZA-94Z No. Description Part No. Notes No. Description Part No.
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Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.9 Control Chassis Assembly: CB-319 9 - 18 No. Description Part No.
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MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.10 24CH Input/Output Assembly: ZA-95A October 1990 No. Description Part No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Panel, Amp Chassis Rear Panel Panel, Output Transformer Wire Assembly, Amp Control Connector, XLR Connector, XLR Hinge, R Hinge, L Collar, Panel Output Transformer Assembly Angle, Input Trans P.C.B. Assembly P.C.B. Assembly, Input Transformer P.C.B.
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Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.11 Power Supply Assembly: DS-4W 9.11.1 Power Supply Assembly [1] 9 - 22 No. Description Part No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Cover, Power Supplies Frame, Heatsink Heatsink B Rectifier Heatsink A Transistor Transistor Regulator Regulator Sheet, Transistor Insulation Connector Stud P.C.B. Assembly, Power Supplies P.C.B.
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MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.11.2 Power Supply Assembly [2] No. Description Part No.
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Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.12 Case Assembly: K1176 9 - 26 No. Description Part No.
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MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.13 Remote Control Assembly: CB-147-S April 1992 No. Description Part No. 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 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Panel, Front Escutcheon, Front Cover, Acryl Bracket, Angle P.C.B. Assembly, indicator Angle, P.C.B. Mount P.C.B. Assembly, Deck Switch P.C.B. Assembly P.C.B.
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Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.14 Auto Locator Assembly:CB-148-S 9 - 30 No. Description Part No. Notes 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 Panel, Front Escutcheon, Front Protector, B, Switch Cap, Rec Cap, Play Cap, Stop Cap, FF, Rew Cap, Zero Set Cap, Search Zero Cap, Search Cap, Shuttle Cap, Auto Rewind Switch Lamp Bracket, Switch Connector P.C.B., Switch Stud P.C.B.
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MTR-90III Operation and Maintenance Manual October 1990 Section 9 Exploded Views and Parts Lists 9 - 31
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Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual Hardware Name Code Name Code Bind SEMS Screw BS Hex Head Bolt H Pan SEMS Screw PS Hex Nut N Triple Screw TS Flat Washer W Binding Head Screw B Fiber Washer FW Pan Head Screw P Stainless Steel Washer SSW Flat Countersunk Head Screw F Spring Washer SW Oval Countersunk Head Screw O Lock Washer LW Truss Head Screw T Knob Washer KW Pan Screw with Spring Washer and Flat Washer PZ Retaining Ri
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Appendix A An external clock (reference oscillator) can be used to control the speed of the MTR-90III capstan motor. When the SPEED MODE switch is set to the EXT position (see § 3.2), a suitable input signal must be applied to P/N18 of the EXT CLOCK input connector (25 pin Honda connector on the MTR-90III rear panel) or P/N20 of the PARALLEL I/O connector.
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Appendix A MTR-90III Operation and Maintenance Manual SMPTE Location Control and Synchronization SMPTE is an acronym for the Society of Motion Picture and Television Engineers. SMPTE time code is a standard digital coding technique for identifying the location of an audio or video tape; coding is done in hours, minutes, seconds and frames (24 frames/second for film or 30 frames/second for video). A time code generator is used to record the code onto one track of the tape.
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MTR-90III Operation and Maintenance Manual Appendix A 4. When a wideband reader synchronizer is used, it is necessary for the MTR-90 to reproduce the complex waveforms of the SMPTE code at 10 or 20 times normal play speed. To enable the MTR-90II to reproduce time code accurately at these speeds one of the following changes must be made: A. The WBR-1S is a piggyback PCB attached to an audio channel PCB.
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Appendix A MTR-90III Operation and Maintenance Manual Adams-Smith 2600 SMPTE Synchronizers Figure A-1 illustrates the necessary cables for interfacing the Adams-Smith Model 2600Y Tape Synchronizer with the MTR-90III EXT CLOCK or Parallel I/O connector. The following notes apply to Figure A-1. 1. Typical Form C relay contact. 2. Typical transistor switch output. 3. This connector optional when Slave LTC Reader is used; otherwise not required. 4.
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MTR-90III Operation and Maintenance Manual ADAMS-SMITH 2600SY TAPE SYNCHRONIZER AMPHENOL 57-30500 Appendix A MTR-90III EXT CLOCK HONDA MR-25LW P/N CN225215 MTR-90III PARALLEL I/O 1 STOP 2 1,8 12 STOP 3 13 F.FWD 4 14 REW 5 11 PLAY 2 15 TACH 7 27 31 F.FWD 2,8 32 6 7 REW 8 8 33 34 PLAY 8 35 9 13 14 PAUSE 39 CTL/TACH 18 17 6 DIRECTION 44 21 DIRECTION GROUND 26 17 GROUND 16 16 REF.OUT 19 18 REF.
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Appendix A MTR-90III Operation and Maintenance Manual BTX Shadow Synchronizer Figure A-2 illustrates the necessary cable for connecting the BTX Shadow Synchronizer with to the MTR-90III. The Capstan Speed Control Range of the Shadow must be adjusted for a range of 50% to 200% of normal play speed. Use the "speed %" display on the CB-147 Remote Control Unit to assist in this adjustment. Refer to the BTX Shadow Synchronizer operation manual for further details.
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MTR-90III Operation and Maintenance Manual Appendix A Audio Kinetic Q-Lock Mod. 2.10 Synchronizer Figure A-3 describes the necessary cable to interface the MTR-90III to the Audio Kinetic Q-Lock Synchronizer. Q-LOCK TRANSPORT CONTROL CONNECTOR MTR-90III EXT. CLOCK CONNECTOR MTR-90III PARALLEL I/O 1 LINK IN "D" CONNECTOR 6 18 EXT CLOCK 20 9 1 REC TALLY 10 14 11 PLAY CMD 2 15 17 GROUND 16 16 13 F.
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Appendix A MTR-90III Operation and Maintenance Manual EECO MQS 100 Synchronizer The EECO MQS 100 is an SMPTE code base system, and as such requires the machine to reproduce SMPTE time code at fast wind speeds (approximately 420 ips). This wide bandwidth reproduction is achieved through the use of the Otari accesory WBR-1S. The WBR-1S is a piggyback PCB Assembly attached to an audio channel PCB Assembly.
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MTR-90III Operation and Maintenance Manual Appendix A MQS-100 D-37 CONNECTOR 16 17 MTR-90III EXT. CLOCK CONNECTOR PLAY TALLY STOP TALLY MTR-90III PARALLEL I/O 2 11 3 12 15 F.FWD TALLY 4 13 14 REW TALLY 5 14 6 6 11 2 12 3 13 4 14 5 16 19 17 16 18 20 9 12 13 11 10 37 8 2 19 LIFT COMMAND PLAY COMMAND STOP COMMAND F.FWD COMMAND REW COMMAND CAPSTAN REF GROUND EXT.
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Index A accessories optional 7-5 standard 7-5 all input mode 3-9 all repro mode 3-9 all sel·rep mode 3-9 AMP REMOTE connectors 3-5 audio alignment 6-20–6-25 audio attenuation 2-2 audio connections 2-10 audio input/output connectors 3-5 AUDIO PCB Assemblies 5-5, 6-20, 6-21, 6-22, 6-23, 6-24 auto locator 2-7–2-8, 2-9 ALL CLEAR button 3-14 attaching the stand assembly 2-7 AUTO REWIND button 3-12 F.
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Index M master audio attenuation switch 2-2, 2-3 MASTER CPU PCB Assembly 2-2, 6-19 MASTER CPU PCB Assembly adjustment 6-19 mixdown 4-8 N NR REMOTE connector 2-11, 3-5 O offset mode (auto locator) 3-10, 4-16 1" to 2" track conversion 6-27 overdubbing ( see sel·rep recording) P PARALLEL I/O connector 2-13, 3-6 PLAY button 3-3, 4-3 play mode 4-2, 4-5 POWER SUPPLY PCB Assembly 2-2 power connections 2-10 POWER connector 3-6 power supply conversion 2-14 POWER switch 4-3 turning on the power 4-3 Printed Circui