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5.1
Feed section
Is 2V at IC601 pin 63?
YES
Is 4V present at both
sides of the feed motor?
YES
Check the feed motor.
5.2
Focus section
5.3
Spindle section
Is the disk rotated?
YES
Does the RF signal
appear at IC601 pin 26?
YES
Is the RF waveform
at IC601 pin 26 distorted?
YES
Proceed to the Tracking
section
5.4
Tracking section
When the disc is rotated
at first:
Is the tracking error
signal output at IC601
pin 57?
Check IC601.
1-32 (No.MA047)
SECTION 5
TROUBLESHOOTING
NO
Is the wiring for IC601
pin 63 correct?
NO
NO
Is 2V present at IC681
pins 1 and 27?
NO
Check IC681.
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC681 pins 10 and 11?
YES
NO
Is 4V present between
IC681 pins 6 and 7?
YES
Check the spindle motor
and its wiring.
NO
Check the circuits in
the vicinity of IC601
or the pickup.
NO
Check the circuits in
NO
the vicinity of IC601
pins 48 and 49
Approx. 1.2V
YES
YES
Is 8V present at IC681
pins 3 and 12?
YES
Check the vicinity of
IC601.
YES
Check the feed motor
connection wiring.
Check the circuits in
NO
the vicinity of IC681
pins 13 and 14.
YES
Check the pickup and
its connections.
NO
Is 4V present at IC601
pin 64?
YES
Check the vicinity of
IC681.
NO
Check the pickup and
its connections.
.
NO
Check CD8V.
NO
Check IC601.
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