Aiwa xc-rw700 Service Manual page 65

TROUBLESHOOTING - 2/26
QQ
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2) When +12V(I/O) doesn't appear,
When +12V doesn't appear,
YES
Is the D910 normal?
YES
Is the IC907 normal?
YES
+12V Power in PCB is short.
4) When 5V(A-5V, D-5V) doesn't appear,
When 5V(A-5V, D-5VA)
doesn't appear,
YES
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Is 5V supplied to the Q902
Emitter?
YES
Is the Q901 collector the
electrical potential of GND?
YES
Check and replace Q902.
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NO
Check and replace the
D910.
NO
Replace the IC907.
NO
Check and replace D909.
NO
Check the PWR CTL signal
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8
3) When -12V(I/O) doesn't appear,
When -12V doesn't appear,
YES
Is the D908 normal?
YES
Is the IC906 normal?
YES
-12V Power in PCB is short.
5) When 5V(5VD CDR) doesn't appear,
When 5V(CDR) doesn't appear,
YES
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3 6 7 1 3 1 5
Is 5V supplied to the Q907
Emitter?
YES
Is the Q908 collector the
electrical potential of GND?
YES
Check and replace Q907.
co
.
-65-
9 4 2 8
NO
Check and replace D908.
NO
Replace IC906.
0 5 8 2 9 9 4 2 8
NO
Check and replace D909.
NO
Check the PWR CTL signal.
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