Service manual
Table Of Contents
- 1. Introduction
- 2. The RA-3/3A Chassis
- 3. RA-3/3A Power Supply Troubleshooting
- 4. RA-3/3A Shutdown and Self-Diagnostics
- 5. RA-3/3A Deflection Circuits
- 6. RA-3/3A Video Process Troubleshooting: T & S Models
- 7. Troubleshooting the RA-4 Chassis
- 8. RA-4/4A Power Supply Troubleshooting
- 9. RA-4/4A Protect Circuit Troubleshooting
- 10. RA-4/4A Deflection Circuit Troubleshooting
- 11. RA-4/4A High Voltage Circuit Troubleshooting
- 12. RA-4 Video Troubleshooting
- 13. Troubleshooting the RA-4A Chassis
- 14. RA-4A Video Circuit Troubleshooting
- 15. Troubleshooting the RA-5A Chassis
- 16. RA-5A Power Supply Troubleshooting
- 17. RA-5A Protect Circuit Troubleshooting
- 18. RA-5A Deflection Circuit Troubleshooting
- 19. RA-5A High Voltage Circuit Troubleshooting
- 20. RA-5A Video Path Troubleshooting
- 21. Troubleshooting the RA-6 Chassis
- 22. RA-6 Power Supply Troubleshooting
- 23. RA-6 Protect Circuit Troubleshooting
- 24. RA-6 Deflection Circuit Troubleshooting
- 25. RA-6 High Voltage Circuit Troubleshooting
- 26. RA-6 Video Circuit Troubleshooting
- 27. Troubleshooting the AKB Circuits
- 28. Auto Registration Troubleshooting
- 29. Model-to-Chassis Cross Reference
53
11. RA-4/4A High Voltage Circuit Troubleshooting
6
5
4
3
6
1
3
2
1
5
6
7
6
5
7
9 9
A BOARD
D BOARD
R8165
+135V
R8164
R8163
R8161
R8162
FROM
ABL
T8003/11
CN8003
JUMPER
PLUG
C8086
R8160
R8156
R8129
IC8009
R8123
+12V
R8118
D8035
RD5 - 1M
D8048
R8135
R8121
D8032
FROM
T8003/6
C8077
R8140
C8084
R8202 R8194
CN8007
R8193
+12V
Q8028
N
R8171
C8093
R8125
C8073
R8117
+12V
C8083
Q8031
N
R8091
C8104
R8191
R8192
D8050
R8175
C8096
D8040
C8075
C8075
R8122
R8110
R8609
IC8006
D8045
MA3041
D8038
RD13M
IC8010
D8026
+12V
R8103
R8094
Q8021
R8092
C8054
N
CN8009
R8058
C5095
CN506
C8111
D8021
+12V
R8097
TO
Q8027/B
HV STOP 1
TO HD
BUFFER
Q8005/B
TO
IC1009
OSD CPU
FROM HV
STOP 1
IC8010/1
& IC8008/1
FIGURE 11-6 - HV STOP 2
11.6TVP14 7/11/02
+12V
Troubleshooting Tips: Since there are two sets of protect circuits, isolating which one is activating is the first step.
This is easily accomplished by monitoring either anode of D8021 in Figure 11-6 to determine which circuit is
sending the high signal. This may only be useful if a problem exists within one of the devices in either protect
circuit. A legitimate high voltage problem may trigger both protect circuits. If high voltage and current levels have
been absolutely verified to be within specifications, this is the only time when it is safe to defeat these circuits for
troubleshooting purposes in order to locate the component causing the false shutdown.