1-26 (No.MA142)
SECTION 5
TROUBLESHOOTING
5.1
Feed section
5.2
Focus section
5.3
Spindle section
Check the feed motor.
Is 4V present at both
sides of the feed motor?
Is the wiring for IC601
pin 63 correct?
NO
YES
YES
Is 5V or 0V at IC601
pin 63?
NO
Is 6V or 2V present at
IC681 pins 26 and 27?
NO
Check IC681.
YES
YES
Is 5V present at IC681
pin 19?
Check the feed motor
connection wiring.
YES
Check the vicinity of
IC601.
NO
Check CD8V.
NO
When the lens is
moving:
Check the circuits in
the vicinity of IC681
pins 13 and 14.
Does the S-search
waveform appear at
IC681 pins 10 and 11?
4V
YES
NO
YES
Check the pickup and
its connections.
Is the disk rotated?
YES
NO
Is 4V present between
IC681 pins 6 and 7?
NO
Is 4V present at IC601
pin 64?
NO
Check IC601.
Does the RF signal
appear at RF test point?
YES
YES
Check the spindle motor
and its wiring.
Is the RF waveform
at RF test point distorted?
Proceed to the Tracking
section
Check the circuits in
the vicinity of IC601
or the pickup.
YES
Check the vicinity of
IC681.
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at IC601
pin 57?
YES
Check IC601.
Check the circuits in
the vicinity of IC601
pins 41 to 49.
NO
Check the pickup and
its connections.
NO
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