Sony KD-34XBR2 Training Manual page 25

Chart 7-2 - Follow procedure 1-3 to locate PS Shutdown problem
1. Measure B+ at R6598
(0.27 ohms fusible at 1W)
B+ is LOW or 0V
B+ is HIGH (shutdown –
Stby light blinks 3 times)
Chart 7-3 - IC6501 Typical Voltages (Power ON, Video 1 input, Dark screen)
1. 2.
2.5V 1.8V
10. 11.
10V 0V
Use the Hot ground shown in figure 1 at CN6501/pin 6 (black wire).
HA-3 Chassis
Voltage
+15V 15V Bridge Rectifier D6514
+24V CN6503/pin 7 or 8
+135V CN5509/pin 9
+200V Fusible R8051 or Q8014/D
Use Cold Ground such as the tuner or FBT shield. Heat sinks are not reliable ground
Use Cold Ground such as the tuner or FBT shield. Heat sinks are not reliable ground points.
CN5509/1
R8051
Q8014
FBT
HA-3 Chassis - D Board
2. Measure
IC6501/pin 2 Voltage
Higher than 2V
Lower than 2Vdc
Higher than 2V
Lower than 2Vdc
3. 4.
2.2V 2.5V
12. 13.
4.7V 0 V
Chart 7-4 - Checking the Primary PS Output
Checkpoint
CN6503/1
+
D6515
IC6501
Figure 7-3
Voltage Checkpoint
Locations
7. Secondary Power Supply HA-3 & RA-5A Chassis
3. Problem area
Oscillator stage IC6501
Error regulating stage
IC6503/PH6502
Error regulating stage
IC6503/PH6502
Oscillator/Driver Stage
IC6501
5. 6. 7.
0V 0V 4.0V
14. 15. 16.
-15V -19V -19V
RA-5A Chassis
Voltage
+15V CN6106/pins 7 & 9
+22V CN6106/pins 4 & 6
+135V CN6106/pin 1
AC in
RA-5A Chassis - G Board
22
8. 9.
18.3V 0V
17. 18.
0V 1.5V
Checkpoint
CN6101/1
IC6001
R6041