Sony KP-51WS500 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
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
Microcomputer receives H Stop data from Q378
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
Q8001 detects it and shuts-down the POWER ON RELAY. The microcomputer detects it and
Q378 detects it and shuts-down POWER ON RELAY.
Q378 and makes the LED blink.
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
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KP-51WS500/57WS500/65WS500
34
6. H STOP
35
Q378
IC8006
H PULSE
HV Detector
Detector
4. V STOP
Q8001
V Pulse Detector
C Board