Sony KP-48V80 Service Manual page 6

KP-48V80/53V80/61V80
RM-Y905 RM-Y905 RM-Y905
6. 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. 2A or more, microcomputer detects it via IC651.
OVP In case of +B becomes approx. 150V or more, POWER ON RELAY shuts down and microcomputer detects it via IC651.
Reset by turning power on/off just the same as OCP.
V Stop In case of microcomputer detects 2 seconds or more interval of V Pulse, Reference Pulse turns off by turning off the picture
signal in YC Jungle IC (IC206).
After the picture signal turns off, H Pulse is regenerated 2 seconds or more, the picture signal turns on.
AKB IK detection. Makes LED blinking in case of microcomputer doesn't detect IK returns of IC206 CXA2147Q 30 seconds or more.
H Stop In case of HV becomes 33kV or more, IC502 detects it and shut-down H Drive Pulse.
Microcomputer receives H Stop data from IC206 and makes LED blinking.
Audio In case of DC component overlaps the output of Audio Amp., microcomputer detects it and makes LED blinking.
Microcomputer forces to shut down the power.
Self-diagnosis block diagram
8
4. V.STOP (V Pulse)
TIMER/STANDBY
55
5. AKB
6. H STOP
IC002
49
µProcessor
47
50
48
20 21 22
IC064
EEPROM
IC406
Audio AMP
Audio
3. OVP
IC651
OVP Buffer
2. OCP
OCP Buffer
D1201
Q006
IC206 43
3
35
CXA2147
4
34
YCJ
BUS
27
IC1509
V Drive
5. AKB
DC Detect
OVP DETECT
OCP DETECT
– 6 –
6. HV STOP
IC1502
HV Detector
Q1505
V Pulse Buffer
C Board