Training Manual KDP-57XBR2 Projection Television Troubleshooting RA-3/3A, RA-4/4A, RA-5A, RA-6 Chassis Practical Troubleshooting Tips Course: TVP-14
Table of Contents 1. Introduction .......................................1 The RA-5A Chassis The RA-3/3A Chassis 15. Troubleshooting the RA-5A Chassis ...............................67 2. The RA-3/3A Chassis ........................2 3. Power Supply Troubleshooting ......3 The Main Power Supply ....................................... 6 4. Shutdown & Self-Diagnostics ........12 5. Deflection Circuits ...........................14 6. Video Process Troubleshooting: T & S Models ...........................
28. Auto Registration Troubleshooting ................................. 113 Overview............................................................... 113 Flash Focus Errors ............................................. 115 Error Codes .......................................................... 119 29. Model-to-Chassis Cross Reference ................................
1. Features Chapter 1 - Introduction In the fall of 1996, Sony Electronics introduced a troubleshooting course (TVP-06) that covered troubleshooting of the AP and RA-1 chassis, along with the prior EX and EXR model sets. The course provided some useful and practical approaches to repairing failures that might occur in each of the circuits, and allowed the technician to focus on troubleshooting more than theory of operation.
1. Features Chapter 2 - The RA-3/3A Chassis Overview The RA-3 chassis introduced a major redesign in the convergence circuits that made it much easier for the technician to converge the set with greater accuracy and speed. It is know as Flash Focus TM and allowed the customer to perform more thorough convergence realignment should it drift out of range. The RA-4 was actually the first unit to introduce this feature a year earlier, but it was confined to the more expensive XBR200 series units.
3. RA-3/3A Power Supply Troubleshooting Chapter 3 - RA-3/3A Power Supply Troubleshooting he Standby Power Supply The standby supply is a simple switched-mode type utilizing a single transistor, transformer and feedback circuitry to generate approximately 7VDC provided to a 5-volt regulator IC. Regulation will be provided by changing the oscillation frequency based on current demand. Notice that the regulated 5 volts not only provides standby power for the microprocessor, but also powers the main relay.
3. RA-3/3A Power Supply Troubleshooting FB621 D601 T602 SRT R607 4.7 OHMS 1 FROM T601/1 AC Hi SIDE D602 C617 R620 2 11 3 10 TO RY601 POWER RELAY D623 R609 7.2VDC D D667 C614 4 S CN605 I 9 R616 Q601 2SK2845 IC655 5V REG BAO5T G C616 O C650 D607 D604 MTZ-T-77 -15 10 STANDBY +5V TO A BOARD CN681 C676 5 8 R615 R608 R622 C609 R638 D610 6 C608 Q602 PROT. R605 D605 RD6.
3. RA-3/3A Power Supply Troubleshooting Once the FET has been changed along with R607, you will need to disconnect the secondary voltage line by lifting D667. This is very important since switch-mode supplies draw very small amounts of current while running unloaded and the load from the 5-volt line must be kept from drawing any current. Many technicians are fearful of running switch-mode supplies unloaded. Most are able to run unloaded, but this test is not going to supply more than 40VAC.
3. RA-3/3A Power Supply Troubleshooting job properly. Since they are part of a loop, one affects the other. This is where many technicians run into difficulties. It is similar to working on vertical deflection circuits. They are one of the more simple circuits in a television but seem to be one of the more difficult to diagnose because of the reliance on feedback. The first task is to isolate the failure in either the feedback loop or the oscillator. This can be done in a surprisingly simple way.
3. RA-3/3A Power Supply Troubleshooting Once C620 has charged, the upper transistor will lose its large B-E current and turn off. The impedance of the primary in T604 will determine how fast C620 is charged and this will vary depending on the amount of current in the control winding at pin 7 and 8 of T604. This is how this supply will regulate. The field will not collapse and all induced voltages will reverse polarity.
3. RA-3/3A Power Supply Troubleshooting AUDIO GND AUDIO B+ AUDIO B- T605 PIT D665 +15V C659 6 C658 5 -15V +5V IC653 D660 D659 R656 -5V IC652 R652 R654 +135V C662 A BOARD R655 50V/DIV 5uS T/DIV D658 C602 R619 R610 R611 D603 1/2W C612 R602 0.82Ω 20W HOT GND RY601 C612 2 IC601 MXO8 41AB-F C622 C620 R612 0.1Ω AC C664 N C624 R668 R680 N 7 R618 12V STBY C621 8 C623 R679 D665 R676 C673 Q653 SOFT START R669 R617 Q651 BACK-UP 2 CN652 2 D666 TO R677 T604 PRT PROT.
3. RA-3/3A Power Supply Troubleshooting Troubleshooting Once a few standard procedures are followed, this power supply is not too difficult to repair. The greatest obstacle is the precise timing required for the two transistors inside of IC601 to work together. They form a classical AB-type amplifier design. This means the transistors need to be biased near the upper end of the cutoff point and this is provided by resistors R610 and R611 for the upper half and R621 and R618 for the lower.
3. RA-3/3A Power Supply Troubleshooting No AC Current Is Read: You have a supply that will not start. This is not common, but can occur. Bring the AC voltage up to 40 volts. It is recommended to not exceed this level just in case you accidentally cause the oscillator to start while probing around with the scope and meter. The first important step is to measure the voltage at the collector of the upper transistor.
3. RA-3/3A Power Supply Troubleshooting B+ Regulator Troubleshooting B+ Voltage Too High: This symptom can be a little troublesome to work with because the unit will be going into shutdown protect and there is the possibility of damaging components (particularly the horizontal output transistor). Once again, the main relay is going to be jumped, but this method works quite well if the proper steps are carefully followed. Make sure that the unit is in the off mode.
4. RA-3/3A Shutdown and Self-Diagnostics Chapter 4 - RA-3/3A Shutdown and Self-Diagnostics Overview Another new feature introduced in the RA-3 Chassis is self-diagnostics capability. By utilizing the timer LED on the front panel, it can be flashed in sequences when a failure occurs to assist in troubleshooting. It works rather well in most situations, but can also mislead the technician.
4. RA-3/3A Shutdown and Self-Diagnostics Protection Circuits Not Covered By Self-Diagnostics There are four protect circuits that are not monitored by diagnostics. Consequently, they will not be identified by the timer LED or stored into the diagnostics page. Referring to Figure 4-1, the standby 5V regulator IC655 is protected against over-voltage to its input and excessive current at the output. The 11V line on the secondary is monitored for excessive current (or a complete loss of it).
5. RA-3/3A Deflection Circuits Chapter 5 - RA-3/3A Deflection Circuits Overview Like the RA-2 chassis, the RA-3 utilizes a simple deflection circuit design much like those found in many of the direct-view models. Figures 5-1A and 5-1B illustrate the simplicity of this design. High voltage and horizontal sweep are accomplished with a single horizontal output transistor driving a flyback transformer and deflection yokes.
5. RA-3/3A Deflection Circuits CN506 FROM Q502 H OUT COLLECTOR 1 1 1 200V T504 FBT H+ TO HY BLOCK DYR 4 4 4 135V 2 TO HEATERS 6 R584 R548 + DYG 4 4 -12V 2 1 1 1 5 D522 CN502 CN505 TO FOCUS PACK 7 +12V R545 H- - 3 10 C536 R598 9 CN504 TO ABL 1 1 + 8 D532 DYB R594 R586 4 4 D528 IC502 TO A BOARD IC206 PIN 43 R536 - 6 + 7 1 R544 +4V C550 C516 R511 R566 1 R522 L505 R532 C546 4 TO D518, L503, Q503, PIN AMP. C549 C543 C542 D507 D506 7.
5. RA-3/3A Deflection Circuits Once the new transistor has been installed, it is always a good idea to re-solder the connections on the horizontal drive transformer. These transformers handle a lot of current to forward bias the B-E junction of the output transistor. They get hot and run at high frequency, so it is common for solder connections to go bad. Solder the connections very well. You want the solder to flow up into the internal pin connections at the windings.
5. RA-3/3A Deflection Circuits to the horizontal deflection yoke return. One more waveform is required, however. Vertical rate parabolic correction cannot be injected directly into the horizontal circuit, which is tuned for 15.75KHZ. The parabolic correction must be gated to provide horizontal-rate pulses that can be accepted by the horizontal deflection circuit. These correction pulses will vary in amplitude based on where they occur during the vertical parabolic level.
5. RA-3/3A Deflection Circuits VS IN +15V A BD 51 ABL IC206 3 28 Y/C 4 JUNGLE CXA2025AS SCL SDP R280 ABL CN1301 7 40 9V SAW OSC. V- V+ 39 34 R1533 C277 FROM CN506/7 R1584 C288 R1578 C1522 R300 N D1501 5.
5. RA-3/3A Deflection Circuits Check for V drive out of pins 34 and 35 of the Y/C Jungle IC206. Since this unit shuts down during a vertical failure, you will have to override by shorting the main relay. Unplug all three CRT sockets when doing this. It is obvious why this unit shuts down during a vertical failure. If IC206 does not output vertical sawtooth signals from the + and – drives at pins 34 and 35, it is likely at fault.
6. RA-3/3A Video Process Troubleshooting: T & S Models Chapter 6 - RA-3/3A Video Process Troubleshooting: T & S Models Overview One of the more significant video features introduced in the RA-3 chassis was addition of component video input. This was added to all models from the T series all the way up to the V line. Since DVD and satellite boxes were offering this video format, it was a welcomed addition, which took advantage of its better picture quality capabilities.
6. RA-3/3A Video Process Troubleshooting: T & S Models overall view of the video path. More detailed block diagrams will appear towards the end of this section. They can also be found in the TVP-10 training manual. The goal at this point is to isolate the area in which the problem exists and since there is a main and sub video path along with OSD, these features can be used to help locate where it is occurring.
6. RA-3/3A Video Process Troubleshooting: T & S Models With AKB and high voltage ruled out, the following tests can be performed: The OSD feature is the first tool. Press the menu button on the remote. If you do not have a remote, press channel up or down. The idea is to get the main CPU to generate OSD graphics. If no OSD appears, the Y/C Jungle IC206 is suspect at this point since OSD has its own path directly into it and it is highly unlikely that both the OSD and IC206 have simultaneously failed.
6. RA-3/3A Video Process Troubleshooting: T & S Models the timer LED flash in sequences of five, which will help steer you in the right direction. A prime example of this is the failure of Q706, Q733 and Q764 on the CR, CG and CB boards. Figure 6-4 shows the CG board with Q733 as an example. These transistors, which are responsible for monitoring cathode current, would short or leak if the CRT arced. All three of the transistors are connected to the IK return line via Q734 buffer.
6. RA-3/3A Video Process Troubleshooting: T & S Models IC1905 PIP PROCESSOR SDA9288 Q1916 Y BUFFER YOUT 15 Q1917 Y AMP Q1918 BUFFER 28 Y IN UOUT 14 VOUT 4 30 U IN IC1903 YUV SWITCH BU4053 DVD SW 2 FROM IC1904/3 Q1905 BUFFER 32 V IN 8 3 X IN YOUT 9 4 XQ UOUT 21 SDA 7 22 SCL VOUT SDA SCL TO IC1901/6 YUV SW. Q1914 BUFFER SEL 12 11 Q1907 BUFFER Q1903 BUFFER RU OUT 7 V 13 RV IN TO IC1901/2 6 RV OUT 20 VOUT 19 UOUT 18 YOUT 13 PB FROM J1106 COMPONENT INPUT PR 26 XNTSC X1902 3.
6. RA-3/3A Video Process Troubleshooting: T & S Models V Model Video Troubleshooting These models have several additional features not found on the lower-end sets. A 3D comb filter provides higher quality cross-talk separation along with noise reduction circuitry for the Y component. This is why the S video inputs are routed through the comb filter. Only the component inputs will bypass this circuit.
6. RA-3/3A Video Process Troubleshooting: T & S Models view video where it is inserted into the Y/C Jungle into a separate port. By engaging this function, you can get a good idea of where the video loss is occurring. When the twin boxes appear, the main video source will be displayed in the right box and the sub video in the left. What you will observe is one of three possible conditions: Video in the right and left boxes, video only in the left box or no video in either box.
6. RA-3/3A Video Process Troubleshooting: T & S Models IC202 4MB EDO MSM514265C D BOARD 22 DB1 Q210 BUFFER Q210 BUFFER 4 FL203, Q215, 216 B.P.F.
6. RA-3/3A Video Process Troubleshooting: T & S Models MAIN C FROM IC1702/58 DY FROM IC1405/86 Q1418 BUFFER 1 DU FROM IC1405/90 Q1420 BUFFER 3 DV FROM IC1405/88 Q1419 BUFFER P-Y YOUT 8 7 EY IN 9 8 ERY IN ROUT 20 Q220 BUFFER 9 GOUT 24 Q219 BUFFER 7 BOUT 26 Q218 BUFFER 5 CN204 MAIN U FROM CN401/3 21 MAIN V FROM CN401/1 MAIN Y FROM Q1402 PR-Y BYOUT 10 DVD B-Y TVOUT 12 DVD R-Y CLAMP 5 23 DVD Y 22 TO V CHIP MAIN Y SW.
1. Features Chapter 7 - Troubleshooting the RA-4 Chassis Overview The RA-4 chassis represented a great leap forward for Sony in the rear projection television market. One of its most outstanding introductory features was the ability to perform line doubling of the standard 480i NTSC scan rate. By doubling the scan horizontal scan rate to 960i, the annoying scan lines that were prevalent on these large-screen sets were virtually eliminated.
8. RA-4/4A Power Supply Troubleshooting Chapter 8 - RA-4/4A Power Supply Troubleshooting Overview The RA-4 chassis introduced a new, simpler, standby power supply. Major design changes occurred in the main power supply. An oscillator circuit was now being employed that was independent of the output stages. This oscillator provided the necessary drive signal to two, independent, driver circuits that shared the distribution of power requirements for the set.
8. RA-4/4A Power Supply Troubleshooting L6002 L6001 1 AC (W) C6001 R6002 2 2 1 1 VD6001 AC (L) 4 3 4 AC TO STANDBY SUPPLY D6001 3 C6002 2 F6001 10A CN6004 SPARK GAP FROM VCC C6004 3 1 R6001 SPARK GAPS TO IC6003/2 E AMPR6031 (IF LOW, OSCILLATOR SHUTS OFF Q6004 4 C6012 R6017 N D6032 R6022 C6013 10uF DC TO SOFT START PROTECTION Q6002 RY6001 POWER RELAY 2 C6007 D6002 R6013 R6006 D6009 D6007 C6006 R6010 2.2 OHM 10W R6014 F6002 6.
8. RA-4/4A Power Supply Troubleshooting VCC Switching This circuit is responsible for supplying power to the main relay along with the main oscillator and power switching circuits. It is quite different from conventional designs used in previous models. In Figure 8-3, it is shown that rather than using the relay high command from the CPU to directly control a relay drive transistor, an opticalisolator, IC6011, is turned on by Q6104. A ground return will be provided to Q6001-E, turning on Q6011.
8. RA-4/4A Power Supply Troubleshooting Regulation is provided by varying the operating frequency based on the error amp input at IC6003/pin 1. Initial soft start is provided by keeping Q6006 on for about three seconds at turn on due to C6016 charging. This will pull down the regulation error loop and cause the IC to run at high frequency while the secondary voltages are charging their filter capacitors. The only purpose of Q6005 is to discharge C6016 when the unit is turned off.
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8. RA-4/4A Power Supply Troubleshooting Two rapid relay clicks followed by a third click one to three seconds later: If this condition occurs, the unit is going into protect mode. The timer LED may assist you on this problem as this unit utilizes self-diagnostics although not all protect lines are monitored. In this case, go to Chapter 9 for troubleshooting the protect circuits. Shorted Switching Transistors The greatest concern in this situation is what caused them to short.
8. RA-4/4A Power Supply Troubleshooting is the most common result obtained. IC1601 and its connection to the 135V line are the next check. The most common cause of excessive B+ is an open or increase in value of the resistor connecting the 135V to IC1601 (R6115 in this chassis). If shorting pin 2 of IC1601 does not stop the over-voltage problem, short pin 4 of IC6005. If the voltage now drops, replace IC6005. If it still does not drop, IC6003 or one of the input components may be open.
9. RA-4/4A Protect Circuit Troubleshooting Chapter 9 - RA-4/4A Protect Circuit Troubleshooting Overview The protect circuits in the RA-4 chassis contain several additional sections of monitoring than the RA-3. The high voltage and horizontal deflection circuits are separate, so monitoring deflection loss is necessary. Several more low voltage lines are also monitored. The self-diagnostics feature will assist in isolating a particular circuit, but not all of the monitored lines are sensed by this feature.
9. RA-4/4A Protect Circuit Troubleshooting Audio: DC voltage has been detected on one or both of the audio out lines. The set is shut down to protect the speakers. This is usually caused by shorted audio amp IC406. WDT: A communications error has occurred. The main CPU is unable to communicate with the Y/C jungle IC. The timer LED blinks continuously at one-second intervals and as soon as 101 of them occur, a failure is registered.
9. RA-4/4A Protect Circuit Troubleshooting The other lines monitored are not detected by IC1009 and, therefore, will not be indicated by the self-diagnostics. Figure 9-2 provides a detailed view of these. This includes over-current (or loss of) the +19, +22 and +7 volt lines. The 11V is protected against over-voltage. The base of Q6101 is kept high by the 11V line through R6133. If the +19V or +22V drops below 11.5V, diodes D6122 and D6125 will forward bias, pulling Q6101 base down and turning it on.
10. RA-4/4A Deflection Circuit Troubleshooting Chapter 10 - RA-4/4A Deflection Circuit Troubleshooting Overview With the introduction of scan line doubling, the RA-4 chassis introduced new circuit designs. The horizontal scan rate operates at 31.5KHZ instead of the conventional 15.75KHZ. The YC/Jungle IC is replaced by a separate video process (IC511) and a horizontal jungle (IC507). High voltage is developed in a separate circuit and will be covered in Chapter 11.
10. RA-4/4A Deflection Circuit Troubleshooting Figure 10-2 illustrates the output section of the horizontal deflection stage. Since no flyback transformer is utilized, pulses will be generated by the collapse of the field in the horizontal deflection yokes and T5002. This transformer will provide a boosted voltage for the dynamic focus correction circuit via R5055 and D5015. It also generates a positive and negative voltage source that will be applied to the red and blue CRTs.
10. RA-4/4A Deflection Circuit Troubleshooting Once the new transistor has been installed, it is always a good idea to re-solder the connections on the horizontal drive transformer. These transformers handle a lot of current to forward bias the B-E junction of the output transistor. As they get hot and run at high frequency, so it is common for solder connections to go bad. Solder the connections well. You want the solder to flow up into the internal pin connections at the windings.
10. RA-4/4A Deflection Circuit Troubleshooting R5064 +12V (D) R5015 Q5003 FROM CN5004 IC512/11 4 N VDSP R5006 P PIN E/W R5010 Q5007 R5025 C5022 R5036 R5024 R5041 C5018 Q5017 Q5012 P P R5014 Q5013/E H OUT R5060 R5045 R5066 D5018 P R5037 D5012* Q5011 R5065 R5056 R5044 P R5053 D BOARD R5052 *THIS DIODE IS REPLACED BY A JUMPER IN MOST SETS P Q5020 Q5018 C5031 C5030 C5044 FIGURE 10-3 - PIN AMP -135V FROM CN6002/3 10.
10. RA-4/4A Deflection Circuit Troubleshooting R5023 R5058 Q5009 R5020 P C5020 Q5015 N R5063 D5014 Q5019 FROM R5072 C5041 AC VOLTAGE DIVIDER IN H OUT R5042 R5069 R5068 R5013 D5002 CN506 8 C5011 R5004 C5026 D5008 N D5006 R5018 R5033 H PROTECT TO IC1009/PIN 3 A BOARD C5002 N Q5006 R5030 Q5014 P R5039 C5020 R5061 CN5004 H.P. Q5016 R5048 N R5024 D BOARD R5027 9 H BLK (HP) TO A BOARD CN509 -12V FROM IC6001 FIGURE 10-4 - H PROTECT / HP 10.
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10. RA-4/4A Deflection Circuit Troubleshooting Vertical Deflection Troubleshooting No Vertical Deflection: The first instinct of the technician is to go after the vertical output IC1501 and understandably so. It is a drive component with heavy current usage and heat dissipation, and it is usually the cause of the failure. It is amazing how many techs change this IC first without doing a few checks.
11. RA-4/4A High Voltage Circuit Troubleshooting Chapter 11 - RA-4/4A High Voltage Circuit Troubleshooting Overview The RA-4 chassis reintroduced the separate high voltage circuit that had been eliminated in the RA-2 and RA-3 chassis. This design offers better control of the high voltage level, resulting in more stable brightness and picture size fluctuations. It is also a complicated circuit with regulation control and redundant protection circuits for overvoltage and current problems.
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11. RA-4/4A High Voltage Circuit Troubleshooting If a clean pulse appears with AC current staying well below 1.5 amps, re-connect Q8008 and Q8002 (or the short if you disabled it this way). Apply power once again and continue monitoring the flyback pulse. Do not worry about excessive high voltage problems. The main relay is not part of the protection circuit for high voltage.
11. RA-4/4A High Voltage Circuit Troubleshooting TO HV PROTECT 2 IC8008/3 R8119 R8128 R8139 R8136 IC8007 1/4 7.2V HV BLOCK C8070 6 C8076 R8174 9 7 3 C8082 5 R8126 TO IC8002/5 HV REGULATION PWM 8 10 CN8006 D8041 RD13M 6.9V C8068 Q8024 N +12V IC8007 1/4 R8127 C8052 P Q8025 R8093 D BOARD R8138 R8166 D8039 RD10ES 2 1.5V 1 3 IC8007 1/4 C8074 R8177 R8173 14.
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11. RA-4/4A High Voltage Circuit Troubleshooting TO D8021 OR HV STOP 2 +12V +12V 3 R8116 C8071 1 2 R8176 FROM HV STOP 2 ABL R8170 5.9V D8027 D8025 IC8010 Q8027 R8091 D8036 Q8019 R8111 N C8062 9.3V C8092 R8087 2 C8065 D8030 R8106 R8115 1 TO HD BUFFER Q8005/B C8053 3 IC8008 +12V Q8023 P 7.4V +12V +12V D8024 R8102 IC8006 R8107 C8059 FROM IC8007/7 REGULATION CONTROL 5.1V 2 4.
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12. RA-4 Video Circuit Troubleshooting Chapter 12 - RA-4 Video Circuit Troubleshooting Overview As mentioned earlier in this manual, the RA-4 chassis introduced Sony’s first rear projection television with line doubling capability. New circuitry was designed to perform this task. The DRCTM, or digital reality creator, was added to assist in doubling the horizontal scan lines by interpolating the video information for each of the 480 interlaced lines of the incoming NTSC signal.
12. RA-4 Video Circuit Troubleshooting CCD MAIN Y/COMP. TU501 MAIN TUNER MAIN C IC306 3D COMB FILTER C IC1305 YUV MAIN CHROMA DECODER IC1307 YUV SW. CCD MIX YUV BR BOARD DRC YUV TU501 SUB TUNER MAIN Y OR COMPOSITE IC515 A/V SWITCH SUB CM501 GLASS COMB Y COMPOSITE +S VIDEO 1-5 C SUB C IC1008 MAIN CPU CCD RGB BM BOARD MID YUV IC1301 SUB CHROMA DECODER YUV IC1302 YUV SW. PIP OSD MIX PIP IC511 VIDEO PROCESSOR CV RGB RGB RGB BUFF.
12. RA-4 Video Circuit Troubleshooting Video Appears In Both Boxes: The main and sub video process paths are working correctly. The MID is sending the video directly into IC511. The problem is likely located on the BR board. The DRCTM circuit on this board is constantly running and not controlled by the I²C bus. IC511 controls the selection of the video source. If video signals are present at pins 67, 69 and 69 of IC511, replace IC511.
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12. RA-4 Video Circuit Troubleshooting 9V Q1366 N C1483 CV-Y 28 R1543 SELY 9V R1546 FROM COMB FILTER AYO IC1306/84 P Q1367 IC1307 MAIN YUV SW.
12. RA-4 Video Circuit Troubleshooting FROM Q1343 FSC DETECT.
12. RA-4 Video Circuit Troubleshooting FROM CN516 A BOARD 8 BIT Y CN302 M-Y 8 M-B-Y 6 M-R-Y 8 BIT Y 10 2 4 M-VD IC306 3 CH 8 BIT ADC CN301 RC-Y IC305 TBC 8 BIT C 2 RC-B-Y 4 8 BIT C CN302 IC644 1 MB MEMORY M-HD IC645 1 MB MEMORY IC562 uP CONV. CDX2070Q 6 RC-VD IC304 uP CONV. CXD2071R 8 RC-HD TO A BD. CN511 10 NOM Y 13 BRMI 14 IC303 13.
12. RA-4 Video Circuit Troubleshooting CN001 M-Y 1 M-B-Y 3 CN002 S-Y IC014 SBADC IC003 MAIN ADC 1 S-B-Y 3 S-R-Y 5 M-R-Y 5 M VD 7 IC002 ACH PLL M HD 8 B CH PLL IC008 C CH PLL S-HD 7 S-VD IC010 MID CONTROLLER 8 IC013 MEMORY 10 IC001 MEMORY 11 MID-V MID 12C 12 19 20 MSDA 13 MID Y-S MID R-Y VP MSCL 12 MID-H IC009 MID CPU 14 16 MID B-Y 18 IC005 NVM MID Y 20 BM BOARD FIGURE 12-7 - MID BLOCK 61 12.
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1. Features Chapter 13 - Troubleshooting the RA-4A Chassis Overview The RA-4A chassis shares many of the circuit designs with its predecessor, the RA-4. It is still reserved for use in the high-end XBR series, which includes the KP53XBR300 and the KP61XBR300. Its greatest feature was the introduction of a “high definition ready” television utilizing a 4:3 screen aspect ratio.
14. RA-4A Video Circuit Troubleshooting Chapter 14 - RA-4A Video Circuit Troubleshooting As illustrated in Figure 14-1, many of the same processes are performed to the incoming video signals. All composite and S video sources are routed through the 3D comb filter and chroma decoder for the main video signal. The sub video will pass through a glass comb filter and sub decoder. This will provide the necessary sources for P & P processing for the multi image driver.
14. RA-4A Video Circuit Troubleshooting H + V SYNC TO DEFLECTION CIRCUITS IC511 VIDEO PROCESSOR DTV SYNC TO TUBES V5 DTV INPUT YUV Y Y 12 H SYNC O720P FROM OSD CPU IC1009/61 TO IC515 FOR AUDIO SWITCHING V4 YUV INPUT IC1403 MAIN YUV SELECT YUV IC1307 MAIN YUV SW Y IC1303 SW YUV ODTV IVP Y 480I TO BR BOARD VIN IC1008 MAIN CPU FIGURE 14-2 - DTV VIDEO PROCESSING BLOCK 14.
14. RA-4A Video Circuit Troubleshooting Gray Background Appears With Two Black Boxes: IC511 is OK. This signal is generated by the MID TM. The main and sub video paths are not working. Since a failure in both paths at the same time is unlikely, suspect A/V switch, IC515 or a crack in the board. Screen Is Still Blank: This leaves IC511 as the likely cause. It is not able to process video from either of the inputs from the MID TM or DRCTM circuits. IC511 is getting B+ because high voltage is working.
1. Features Chapter 15 - Troubleshooting the RA-5A Chassis Overview The RA-5A chassis is Sony’s first high definition, 16:9 aspect ratio, rear projection television to incorporate a DTV tuner and decoder as an integrated part of the chassis. This tuner/decoder assembly is known as the “Q Box”. It contains a HDTV tuner, MPEG2 and Digital Dolby® decoding circuits, along with the DRCTM (Digital Reality Creator) and the MID TM (Multi-image Driver).
16. RA-5A Power Supply Troubleshooting Chapter 16 - RA-5A Power Supply Troubleshooting Overview The standby power supply has been changed from a switch-mode to a conventional, analog type. Although simple to troubleshoot, it will be covered since it contains an OVP monitoring circuit that can cause the unit to shut down. The necessary operating voltages at power on have been divided between two switch-mode power supplies, both located on the G board.
16. RA-5A Power Supply Troubleshooting Activating the oscillator is accomplished by closing the main power relay RY6001 when the set is turned on. This will provide approximately 340VDC to Q6008, a startup voltage to pin 18 of IC6002 along with a sample of the unregulated B+ to pin1. Once the IC receives voltage at pin18 and the divided-down sample at pin 1 is 1.7VDC or greater, the oscillator will run and output drive signals as long as the incoming AC voltage is higher than 70VAC.
16. RA-5A Power Supply Troubleshooting Troubleshooting the Primary Supply Since this supply is the starting point for the operation of all necessary power supply operating voltages, it can generate erroneous symptoms that could lead a technician in the wrong direction. The secondary supply is dependent on the primary supply running. Technicians usually check for 135V B+ at the start because a test point is easy to locate at the horizontal output transistor.
16. RA-5A Power Supply Troubleshooting business. This supply has ± supply rails, so do not forget to read across them for low resistance readings. A quick visual check for overheated components is also a good idea. Check for open fuse links on the secondary lines, as these are valuable clues. If the above items check OK, the supply can now be started. Primary Supply Starts - Unit Shuts Down: Two rapid relay clicks are heard followed by a third click one to several seconds later.
16. RA-5A Power Supply Troubleshooting AC D6530 T6002 PIT-AU D BOARD R6041 0.
17. RA-5A Protect Circuit Troubleshooting Chapter 17 - RA-5A Protect Circuit Troubleshooting Overview As illustrated in Figure 17-1, several circuits are monitored for protection. Some lines are monitored by the selfdiagnostics feature while others are not. The self-diagnostics feature can assist in isolating a particular circuit.
17. RA-5A Protect Circuit Troubleshooting The above protection circuits have dedicated communications line with IC001. The 135V OCP/OVP, Low B and H Stop have direct connections. V Stop and AKB notify IC001 by way of the video process IC3006, which announces the event via the data bus line. The remaining lines have no communication ties with the main CPU IC001. They are: 1.
17. RA-5A Protect Circuit Troubleshooting T6003 STANDBY P.S D6017 STANDBY 5V SOURCE R6111 100 R6064 2.2k 1 4 D2016 R6065 12V R6067 C6065 Q6010 OVP 3 2 N R6060 2.2k AC IN OVP PH6004 R6112 100 +15V (SEC P.S.) HV PROTECT FROM 19V OCP D BOARD (SEC P.S.) +19V R6133 + 1k D6015 AC RELAY RY6001 AC IN CN6001 G BOARD P D6001 BRIDGE RECT.
17. RA-5A Protect Circuit Troubleshooting Shutdown – No Diagnostics Indication Since RY6001 and RY6002 are engaging, there are the five monitoring circuits mentioned earlier that will cause the unit go into protect as shown in Figure 17-2. Monitoring AC current draw while letting the unit go into protect will assist in determining whether the failure is current, or voltage related and steer you to the circuits to check first.
18. RA-5A Deflection Circuit Troubleshooting Chapter 18 - RA-5A Deflection Circuit Troubleshooting Overview The deflection circuits in the RA-5A chassis are similar to the RA-4/4A chassis in that horizontal sweep and HV are generated in separate circuits. Pincushion correction is performed in a different manner and HV protection is not monitored as part of the self-diagnostics feature. HV protection is accomplished with fewer components unlike the redundant circuits found in the RA-4/4A chassis.
18. RA-5A Deflection Circuit Troubleshooting FROM E-W IC3006 PIN 47 A BOARD 200V TO DF CIRCUITS 135V 6 2 IC8005 H DRIVE CTL 3 12V D8033 Q8027 IC8009 5 14 1 Q8020 112VDC 1 T8003 HOT 3 1 H OUT 4 H RET 1 H OUT 4 H RET H CENT.
18. RA-5A Deflection Circuit Troubleshooting Repeat Vertical Output IC Failure: If IC1509 fails immediately upon replacement or soon thereafter; it is usually the fault of C8015. This is the boost capacitor. It charges to almost 30VDC during the lower half of the vertical sweep to provide additional voltage to allow the beam to retrace to the top rapidly.
19. RA-5A High Voltage Circuit Troubleshooting Chapter 19 - RA-5A High Voltage Circuit Troubleshooting Overview Figure 19-1 illustrates a block diagram to give an overall view of the circuitry on the D board for generating high voltage.
19. RA-5A High Voltage Circuit Troubleshooting Troubleshooting High voltage circuit failures generally fall into four categories: No HV, low HV, excessive HV and excessive current. The latter two will cause the HV circuit to cease operating and, depending on which protect IC detected the problem, may shut the entire set down. Since the HV protect circuits are not monitored by the self-diagnostics feature, conventional procedures are needed to perform the initial diagnosis.
19. RA-5A High Voltage Circuit Troubleshooting than 7.5V, the HV block is defective. If it is significantly lower, check the PWM signal at pin 3. If the positive duty cycle exceeds the negative, IC8008 is sensing the low HV and trying to compensate. Check for clean pulses at Q8038-C. If they are OK, the HV block is defective. If the negative duty cycle exceeds the positive, IC8008 may be defective. If the duty cycle is near 50%, someone has managed to turn VR8001 out of adjustment.
19. RA-5A High Voltage Circuit Troubleshooting +15V H PULSE LATCH R8138 Q8022 7 + - Q8029 D8023 D8016 5 D8008 FBT ABL 1 6 + - R8157 3 2 R8150 R8151 HV BLOCK SAMPLE FROM IC8008 +15V +15V IC8007 R8142 D8015 + - D8014 MTZJ-5.18 Q8028 D8025 Q8021 7 R8141 FBT ABL D8043 5 1 6 + - R8223 3 2 R8153 R8099 D8038 R8102 T8005 SAMPLE R8128 TO MAIN RELAY LATCH PROTECT +15V IC8006 RV8002 R8139 D8013 MTZJ-5.18 FIGURE 19-2 - HV PROTECT CIRCUITS RA-5A CHASSIS 83 19.
20. RA-5A Video Path Troubleshooting Chapter 20 - RA-5A Video Path Troubleshooting Overview The RA-5A chassis incorporates a DTV tuner and decoder circuits in a shielded board known as the “Q Box”. MPEG2 decoding of ATSC broadcast signals along with Digital Dolby® decoding circuitry allows for reception of all current formats. The DRCTM and MIDTM process circuits are located on this board along with an OSD generator to display the customer menu along with certain HD setup information.
20. RA-5A Video Path Troubleshooting IC7205, IC7603 DTV TUNER AND PROCESS CRT B QM BD. MAIN SIGNAL PATH NTSC INPUT/ PIP C BD. CB BD. IC8801 OSD IC7806, IC7807 DRC PROCESS NTSC MAIN PATH IC8601 IC8703, IC8902 MID PROCESS CN8601/ CN005 U BD. MN-SBSW. A1-3 A9 A5-7 NTSC SUB PATH A3-5 MAIN IC200 COMPONENT NTSC INTERFACE I/F OR IC201 SUB SW. HD CN4001/ CN003 INPUT CR BD. CN8801 A7-9 1, 3, 5 CN3011 Q9, Q11, Q13 MIXER * OSD 13 IC001 MAIN MICRO SUB IC401 A/V SW.
20. RA-5A Video Path Troubleshooting Video Appears in Right Box Only: The sub-video path is working correctly. An interruption in the main video processing has occurred. The problem is likely to be on the B board since most of the processing occurs there. The Q Box routes the main and sub-video into the MID TM circuits for side-by-side display. The problem could be on the Q board. Isolate the two by checking for video signals at CN005 pins A5, A6 and A7. If no video is present, repair or change the B board.
1. Features Chapter 21 - Troubleshooting the RA-6 Chassis Overview The RA-6 chassis is found in the KP51HW40 and KP57HW40 models. It provides an affordable “high definition ready” set with a 16:9 aspect ratio. It is also found in the KP43HT20, KP53/61HS20 and KP53/61HS30 as a “High Scan” 4:3 model. Much of the circuitry is the same as in the RA-5A chassis, especially the deflection and high voltage section.
22. RA-6 Power Supply Troubleshooting Chapter 22 - RA-6 Power Supply Troubleshooting General Description The power generation and distribution has been simplified by utilizing a traditional analog standby supply providing unregulated B+ for the main AC relay and regulated 5V for the main CPU, NVM and IR receiver (not shown). More detail on this circuit will be covered later in the shutdown troubleshooting section.
22. RA-6 Power Supply Troubleshooting AC H RY6002 AC L R6050 R6002 D6007 RY6003 R6064 0.1 1/2W R6040 D6002 R6038 R6003 R6037 18 PH6002 1 3 2 4 16 D6009 D6004 D6005 R5007 0.
22. RA-6 Power Supply Troubleshooting Dead Supply. Switching Transistors Shorted: A more cautious approach must be taken when this happens. There is slight possibility that excessive current or a higher possibility that line transients caused them to fail and the loss of a newly installed set is not only frustrating, but costly in parts and wasted time. Static resistance readings of the secondary lines to ground are the first order of business.
22. RA-6 Power Supply Troubleshooting 3. If a problem exists that warrants protection, a third relay click will be heard. This is actually RY6002 and RY6003 releasing simultaneously and will occur from one to several seconds later. Refer to Chapter 23 for troubleshooting the protect circuits. Assuming two rapid clicks are not occurring and little or no AC current is being drawn, the main supply must now be checked. Place a jumper across RY6002. This will provide start and sense voltages to IC6003.
23. RA-6 Protect Circuit Troubleshooting Chapter 23 - RA-6 Protect Circuit Troubleshooting General Description As illustrated in Figure 23-1, several circuits are monitored for protection. Some lines are monitored by the selfdiagnostics feature while others are not. The self-diagnostics feature can assist in isolating a particular circuit.
23. RA-6 Protect Circuit Troubleshooting AUDIO: DC voltage has been detected on the speaker lines. This is usually caused by audio output IC708. The audio circuits are located on the A board. WDT: A communications error has occurred. The main CPU is unable to communicate with the Y/C jungle IC. The timer LED blinks continuously at one-second intervals and as soon as 101 of them occur, a failure is registered.
23. RA-6 Protect Circuit Troubleshooting Shutdown – No Diagnostics Indication The first step necessary is to listen for the sequence of relay clicks when the unit is powered up. If two clicks are heard less than 500ms apart followed by a third click at least one second later, the protect circuit is activating. The initial rapid clicks indicate the main supply is powering up and the inrush relay RY6003 is activating.
23. RA-6 Protect Circuit Troubleshooting AU+19V 5V D5026 D5017 STBY TRANS. 9.
24. RA-6 Deflection Circuit Troubleshooting Chapter 24 - RA-6 Deflection Circuit Troubleshooting The deflection circuits in the RA-6 chassis are identical to the RA-5A chassis in that horizontal sweep and HV are generated in separate circuits. Horizontal Deflection Troubleshooting Referring to Figure 24-1, horizontal sweep is generated in the conventional way using an H drive signal from pin 40 of IC309 on the A board. It is amplified and transformer coupled to the horizontal output transistor Q8024.
24. RA-6 Deflection Circuit Troubleshooting 200V TO DF CIRCUITS E-W IC309 PIN 47 A BOARD 135V 6 2 IC8005 H DRIVE CTL 3 12V D8033 Q8027 IC8009 5 14 1 Q8020 112VDC 1 T8003 HOT 3 1 H OUT 4 H RET 1 H OUT 4 H RET H CENT.
24. RA-6 Deflection Circuit Troubleshooting Repeat Vertical Output IC Failure: If IC1509 fails immediately upon replacement or in a short amount of time, it is usually the fault of C8015. This is the boost capacitor. It charges to almost 30VDC during the lower half of the vertical sweep to provide additional voltage to allow the beam to retrace to the top rapidly.
25. RA-6 High Voltage Circuit Troubleshooting Chapter 25 - RA-6 High Voltage Circuit Troubleshooting General Description Figure 25-1 illustrates a block diagram in order to provide an overall view of the circuitry on the D board for generating high voltage.
25. RA-6 High Voltage Circuit Troubleshooting Troubleshooting High voltage circuit failures generally fall into four categories: No HV, low HV, excessive HV and excessive current. The latter two will cause the HV circuit to cease operating and a high will be sent to IC704 on the A board to place the unit into protect-mode. The timer LED will flash in sequences of eight. Dead HV Circuit: The initial concern with this symptom is whether the HV output Q8038 has shorted.
25. RA-6 High Voltage Circuit Troubleshooting High Voltage Shutdown: Verification of an over-voltage or over-current condition must be checked first. Monitor the AC current draw at shutdown to determine which is causing the condition. Excessive Current: If the AC current exceeds 2A or more immediately at turn-on, begin by disconnecting the HV block from the circuit.
25. RA-6 High Voltage Circuit Troubleshooting +15V H PULSE LATCH R8138 Q8022 7 + - Q8029 D8023 D8016 D8008 5 FBT ABL + - 1 6 R8157 3 2 R8150 R8151 HV BLOCK SAMPLE FROM IC8008 +15V +15V IC8007 R8142 D8015 + - Q8028 D8025 Q8021 7 R8141 D8014 MTZJ-5.18 FBT ABL D8043 5 + - 1 6 R8223 3 2 R8153 R8099 D8038 R8102 T8005 SAMPLE R8128 TO MAIN RELAY LATCH PROTECT IC8006 +15V RV8002 R8139 D8013 MTZJ-5.18 FIGURE 25-2 - HV PROTECT CIRCUITS RA-6 CHASSIS 102 25.
26. RA-6 Video Circuit Troubleshooting Chapter 26 - RA-6 Video Circuit Troubleshooting General Description The video process circuitry in the RA-6 chassis follows a similar processing path as the RA-5A chassis with the exception on an on-board DTV tuner and decoder. Two NTSC tuners are incorporated along with video inputs 1~4 to allow the connection of composite or S video sources. An extra component input has been added (video 6) along with video 5, to allow two sources of video up to 1080i resolution.
26. RA-6 Video Circuit Troubleshooting CV/Y MAIN TUNER Y IC6 3D COMB C SUB TUNER U BOARD VIDEO 1 VIDEO 2 IC303 YCT MAIN C YUV YUV CV IC004 A/V SWITCH Y C IC2007 2D COMB YUV IC305 YUV SWITCH A BOARD VIDEO 3 SUB Y IC301 YCT SUB VIDEO 4 SUB C YUV VIDEO 5 VIDEO 6 YUV IC3414 YUV SW. YUV PJE OSD AD BOARD IC306 COMP. SW.
26. RA-6 Video Circuit Troubleshooting Video failures fall into three main categories: 1. No video 2. Distorted video 3. Improper level Although the video signals are routed through many different paths depending on the type of signal being received, these different pathways can be used to an advantage when diagnosing video failures. The picture & picture feature provided by the MID circuitry provides a useful diagnostic tool.
26. RA-6 Video Circuit Troubleshooting TU2 MAIN TUNER CV : 1V p-p 8 MAIN RF CV IN RF CH 13 (480i) 75% CB TU2 SUB TUNER CV (480i) 75% CB 1.0vp-p MAIN C 47 OUT CV : 1V p-p V1 CV:1V p-p Y : 0.6V p-p C : 0.6Vp-p SUB 63 RF CV IN 15 17 19 1 3 5 V2 Y/C (480i) 75% CB Y : 0.82V p-p C : 0.62Vp-p 22 24 26 V3 60 V4 Y PB PR (480i) 75%CB Y: 0.82Vp-p PB : O.53Vp-p PR : 0.53V p-p V5 Y PB PR (480P) V6 75%CB Y: 0.82Vp-p PB : O.53Vp-p PR : 0.
26. RA-6 Video Circuit Troubleshooting Y 84 Y : 0.9V46 Y C : 0.5V C 83 IO6 PD6482 3D-COMB MAIN CXA2103-1 SCON,SCOL,SHUE (ADJUST RF,VIDEO,& DVD 48 C 33 34 35 Y PB Y PB PR PR IC303 YCT-MAIN CXA2103 Y PB PR 37,38,39 22,23,24 Y/CV C 88 96 CV : 0.9Vp-p Y : 0.7Vp-p C: 0.5V Y : 1.2V PB : 1.1Vp-p PR : 1.1Vp-p Y : O.7V PB : 0.5Vp-p PR : 0.5Vp-p [MAIN] 480i(RF,V1-6) [SUB] @ MAIN=1080i/480P 1,3,13 Y IC305 PB YUV SW.
26. RA-6 Video Circuit Troubleshooting IC3303 D.R.C. INPUT SIGNAL 480i ONLY CXD29095Q Y : 8 BIT C : 8 BIT YPB PR 8 BIT 174-181 Y :1.0Vp-p PB 0.9Vp-p PR 0.9Vp-p FROM YUV SW. IC305 164-171 6-13 63 50 31 3.2Vp-p DIGITA L 17-24 IC3304 8 BIT A/D TLC5733A Y PB PR [MAIN]480P/1080i (P&P FREEZE) (V5.6) [SUB] 480i(RF,V1-4) FROM COMP. SWITCH IC306 122-154 3.2Vp-p DIGITA L 41-11 215 210 208 Y :0.9Vp-p PB 0.8Vp-p PR 0.8Vp-p Y PB PR IC3408 M.I.D. CXD9509 YPB PR 8 BIT YPB PR 8 BIT 44-71 3.
27. Troubleshooting the AKB Circuits Chapter 27 - Troubleshooting the AKB Circuits Overview The AKB (Automatic Cathode Bias) circuit, often referred to as IK, has been incorporated into Sony televisions for many years. In the beginning it created problems for technicians because they were either unaware of it or did not understand how it worked. The subject was extensively covered in training courses, but the circuit continued to be a difficult one to identify and diagnose.
27. Troubleshooting the AKB Circuits D732 +200V R736 R739 C735 D733 D734 L731 G2 1 TO FOCUS BLOCK CN737 R732 R742 SG731 R741 C732 CG BOARD Q733 Q722 11 D731 CN731 7 G C734 1 1 3 CN733 FROM FOCUS BLOCK 4 CN734 9 TO 7 FROM A BD.
27. Troubleshooting the AKB Circuits If you could actually “see” the IK pulses, troubleshooting would be a snap. If the service mode is entered on a direct-view television, the VPOS can be adjusted to bring the picture centering down and the three IK pulses can be seen as faint lines. If a problem occurred, one or two of the lines would be missing, very faint, or very bright. All three lines could also be either extremely bright or missing completely. It depends on what is causing the AKB problem.
27. Troubleshooting the AKB Circuits CRT elements, improper G2 cutoff or intermittent components, or connections on the IK return line (rare). Verify G2 cutoff and adjust if necessary. If G2 was set too low, this may have been the problem. Measure the DC voltage on all three cathodes. If one or two of the cathodes measures less than 170V, it is weak and is the cause of the intermittent problem. On projection televisions, the blue CRT will be the most likely to cause this problem.
28. Auto Registration Troubleshooting Chapter 28 - Auto Registration Troubleshooting Overview The RA-4 projection television chassis was the first to introduce a new registration system for converging the red, green and blue colors of each CRT. The number of course adjustments were substantially reduced. SUB, MID, BOW and 4 th-family wave adjustments were eliminated. The number of adjustments was reduced to CENT, SKEW, SIZE, LIN, KEY and PIN. MLIN was added to the RA-5A and RA-6 chassis.
28. Auto Registration Troubleshooting verified with a calibrated external source, the internal crosshatch can be centered by changing and saving the value of “TPHP” and “TPVP” at the beginning of the PJE group. When replacing an A board in most models, the NVM for the main CPU will be flashed with default data. This is general service data. The convergence data will be located on one or more dedicated NVM chips. In most cases, the new board can be installed with the default settings.
28. Auto Registration Troubleshooting Fortunately, the RA-5A and RA-6 chassis have included a new set of instructions known as “COPY” and “ALCOPY”. Convergence is adjusted in the FULL mode, saved and Flash Focus TM offset rewritten. ALCOPY is selected from the PJE menu and the data changed from 0 to 1. Pressing “Mute” – “Enter” copies the data from the FULL mode to all the others. The COPY command will perform the same function but will not copy the data to the WIDE ZOOM mode.
28. Auto Registration Troubleshooting The configuration shown will adjust horizontal centering and skew based on the top and bottom sensors and horizontal size by using the left and right pair. Vertical centering, skew and vertical size will occur by the flags changing their position by 90° for the next step as illustrated in figure 28-3. Each procedure is always performed twice since centering and skew adjustments will sometimes affect size.
28. Auto Registration Troubleshooting Flash FocusTM Errors The primary causes of errors appearing during a Flash Focus TM session are: 1. Insufficient brightness level of the flags striking the sensor(s). 2. One or more of the colors “out of range” of the sensors. 3. The flags are being generated out of their normal positions. The latter usually occurs when someone has altered the data for the flag positions or the data has become corrupt.
28. Auto Registration Troubleshooting A single digit change in the data for each option will move the affected flag a considerable distance. These alignments should only be adjusted if the flags display unevenly after correct centering, size and skew have been confirmed with a calibrated source. Error Codes Figure 28-4 illustrates what will appear on the screen if an error occurs. This error message only appears while in the service mode.
28. Auto Registration Troubleshooting Below is a list of possible error codes and suggested remedies. Table 28-1 ERROR CODE DESCRIPTION REMEDY 01 Sensor 0 low output Check if flags are hitting sensor properly. Adjust VUP if necessary. Could be a sensor problem. 11 Sensor 1 low output Check if flags are hitting sensor properly. Adjust HLE if necessary. Could be a sensor problem. 12 Sensor 2 low output Check if flags are hitting sensor properly. Adjust HRIV if necessary. Could be a sensor problem.
28.
, Flash Focus, DRC and MID are trademarks of Sony TVP140702 ©2002 Sony Electronics Inc. EMCS - A Service Company 1 Sony Drive Park Ridge, New Jersey 07656 Reproduction in whole or part without written permission is prohibited.
