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KD-S641
3.2 Troubleshooting
3.2.1 Feed section
Is the voltage output at
IC541 pin 4 is 5V or 0V?
YES
Is 4V present at both
sides of the feed motor?
YES
Check the feed motor
3.2.2 Focus section
3.2.3 Spindle section
Is the disk rotated?
YES
Does the RF signal
appear at ARF TP?
YES
Is the RF waveform at
ARF TP distorted?
YES
Proceed to the Tracking
section
3.2.4 Tracking section
When the disc is rotated
at first:
Is the tracking error
signal output at TE TP?
Check IC501.
1-24 (No.49769)
NO
Is the wiring for IC541
1 ~ 14 correct?
NO
Check the feed motor
connection wiring.
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC561 pins 32?
NO
Is 4V present between
IC541 pins 6 and 7?
Check the spindle motor
and its wiring.
NO
Check the circuits in the
vicinity of IC561 21 ~ 40
NO
or the pickup
Check the circuit in the
YES
Approx. 1.2V
YES
YES
Is 5V present at IC581
Check the vicinity of
IC521.
NO
Check the circuits in
the vicinity of IC541
pins 8 and 9.
Check the pickup and
its connections .
YES
NO
Is 4V present at IC561
Check the vicinity of
YES
vicinity of IC561 pins
21 ~ 40
NO
Check CD 9V
pin 6?
YES
YES
NO
Check IC561 and
pin 29?
YES
IC541.
Check the pickup and
its connections
and 5V.
IC901.
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