(No.MA037)1-25
SECTION 5
TROUBLE SHOOTING
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 28 correct?
NO
YES
YES
Is the voltage output at
IC561 pin 28 5v or 0V
NO
Is 6V or 2V present at
IC561 pins 4 and 5?
NO
Check IC561.
YES
YES
Is 5V present at IC561
pin 21?
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 IC561
pins 15 and 16.
Does the S-search
waveform appear at
IC561 pins 8 and 9?
4V
YES
NO
YES
Check the pickup and
its connections.
Is the disk rotated?
YES
NO
Is 4V present between
IC561 pins 17 and 18?
NO
Is 4V present at IC521
pins 24 and 25?
NO
Check IC521.
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
NO
YES
Check the vicinity of
IC561
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at TP TE?
YES
Check IC521.
Check the circuits in
the vicinity of IC501
pins 1 to 15.
NO
Check the pickup and
its connections.
NO
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