(No.MA027)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 IC561
pin 22 correct?
NO
YES
YES
Is the voltage output at
IC561 pin 22 5v or 0V
NO
Is 6V or 2V present at
IC541 pins 4 and 5?
NO
Check IC541.
YES
YES
Is 5V present at IC541
pin 14?
Check the feed motor
connection wiring.
YES
Check the vicinity of
IC561.
NO
Check CD 8V.
NO
When the lens is
moving:
Check the circuits in
the vicinity of IC541
pins 15 and 16.
Does the S-search
waveform appear at
IC541 pins 8 and 9?
4V
YES
NO
YES
Check the pickup and
its connections.
Is the disk rotated?
YES
NO
Is 4V present between
IC541 pins 6 and 7?
NO
Is 4V present at IC561
pins 24 and 25?
NO
Check IC561.
Does the RF signal
appear at TP RF?
YES
YES
Check the spindle motor
and its wiring.
Is the RF waveform
at TP RF distorted?
Proceed to the Tracking
section
Check the circuits in
the vicinity of IC501
or the pickup.
NO
YES
Check the vicinity of
IC541
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at TP TE?
YES
Check IC561.
Check the circuits in
the vicinity of IC501
pins 25 and 26.
Check the pickup and
its connections.
NO
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