(No.MA051)1-25
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 IC541
pin 40 correct?
NO
YES
YES
Is 5v or 0V at IC541
pin 40?
NO
Is 6V or 2V present at
IC501 pins 4 and 5?
NO
Check IC501.
YES
YES
Is 5V present at IC501
pin 20?
Check the feed motor
connection wiring.
YES
Check the vicinity of
IC541.
NO
Check 8V.
NO
When the lens is
moving:
Check the circuits in
the vicinity of IC501
pins 15 and 16.
Does the S-search
waveform appear at
IC501 pins 8 and 9?
4V
YES
NO
YES
Check the pickup and
its connections.
Is the disk rotated?
YES
NO
Is 4V present between
IC501 pins 6 and 7?
NO
Is 4V present at IC541
pin 41?
NO
Check IC541.
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 IC521
or the pickup.
NO
NO
YES
Check the vicinity of
IC501.
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at IC521
pin 11?
YES
Check IC541.
Check the circuits in
the vicinity of IC521
pins 2 to 12.
NO
Check the pickup and
its connections.
NO
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