Sony KP 48S75 - Manual (Page 6)

– 6 –
KP-43T75/48S75/
53N77/53S75/61S75
RM-Y906
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. 1.3A 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, V 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
55
8
20 21 22
49
47
50 3
27
34
35
43
5. AKB
5. AKB
3. OVP
2. OCP
4. V.STOP (V Pulse)
Audio
IC002
µ Processor
IC206
CXA2147
YCJ
Q006
D1201
TIMER/STANDBY
IC004
EEPROM
IC502
HV Detector
Q1505
V Pulse Buffer
IC651
OVP Buffer
OCP Buffer
C Board
DC Detect
IC1509
V Drive
IC406
Audio AMP
6. H STOP
6. HV STOP
BUS
4
48
OVP DETECT
OCP DETECT