Sony KP-46WT510 Service Manual page 9

Self-Diagnosis Function Operation
OCP Low B and +B line detect DET SHORT, and shut-down POWER ON RELAY.
Reset by turning power on/off. In case of +B is loaded approx. 1.5A or more, microcomputer detects it via IC5005.
OVP In case of +B becomes approx. 150V or more, POWER ON RELAY shuts down and microcomputer detects it via IC5005.
Reset by turning power on/off just the same as OCP.
Low B Occurs when set +5V is out
V Stop In the case of the V Drive disappearing, Q8001 detects it and shuts-down the POWER ON RELAY. The microcomputer detects it and
causes the LED to blink.
AKB IK detection. Makes LED blink when microcomputer doesn't detect IK, returns of IC309 (CXA2150AQ) 20 seconds or more.
H Stop In case H DRIVE disappears, Q378 detects it and shuts-down POWER ON RELAY.
Microcomputer receives H Stop data from Q378 and makes the LED blink.
HV Stop In case HV becomes 33kV or more, IC8006 detects it and shuts-down POWER ON RELAY.
The microcomputer makes the LED blink.
Audio In case of DC component overlaps the output of Audio Amp., the microcomputer detects it and shuts-down POWER ON RELAY.
The microcomputer makes the LED blink.
Self-Diagnosis Block Diagram
53
43
6. LOW B
8. HV.STOP
TIMER/STANDBY
49
5. AKB
31
28
29
30
IC704
IC702
MAIN-CPU
EEPROM
IC703
EEPROM
Audio AMP
44 45 24
9. Audio
3. OVP
2. OCP
+5V DETECT
D9101
R765
IC309
25
CXA2150AQ
26
BUS
Y/C JUNGLE
58
IC8003
V Drive
5. AKB
IC708
DC Detect
IC5005
OVP DETECT
OVP Buffer
OCP Buffer
OCP DETECT
Q714
— 9 —
34
6. H STOP
35
Q378
IC8006
H PULSE
HV Detector
Detector
4. V STOP
Q8001
V Pulse Detector
C Board
KP-46WT510