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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. 1.5A 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 case of V Drive disappeared, Q8001 detecs it and shut-down POWER ON RELAY. Microcomputer detects it and makes LED
blinking.
AKB
IK detection. Makes LED blinking in case of microcomputer doesn't detect IK returns of IC309 (CXA2150AQ) 20 seconds or
more.
H Stop
In case of H DRIVE is disappeared, Q378 detects it and shut-down POWER ON RELAY shuts down.
Microcomputer receives H Stop data from Q378 and makes LED blinking.
HV Stop In case of HV becomes 33KV or more. IC8006 detects it and shut-down
POWER ON RELAY. Microcomputer makes LED blinking.
Audio
In case of DC component overlaps the output of Audio Amp., POWER ON RELAY shuts down.
Microcomputer detects it and makes LED blinking.
Self-diagnosis block diagram
IC704
MAIN-CPU
53
43
6. LOW B
8. HV.STOP
D9101
STANDBY/STEREO
49
5. AKB
31
28
BUS
29
30
IC702
EEPROM
IC703
EEPROM
IC708
Audio AMP
44
45
24
9. Audio
3. OVP
IC5005
OVP Buffer
2. OCP
OCP Buffer
Q714
+5V DETECT
R765
IC309
25
CXA2150AQ
26
Y/C JUNGLE
58
IC8003
V Drive
5. AKB
DC Detect
OVP DETECT
OCP DETECT
– 7 –
KP-HW51K90J/HW57K90J
RM-Y909K
34
6. H STOP
35
Q378
IC8006
H PULSE
HV Detector
Detector
4. V STOP
Q8001
V Pulse Detector
C Board
RM-Y909K
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