1-26 (No.MA056)
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 IC521
pin 22 correct?
NO
YES
YES
Is the voltage output at
IC521 pin 22 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
pins 3,12 and 21?
Check the feed motor
connection wiring.
YES
Check the vicinity of
IC521.
NO
Check CD 8V.
NO
When the lens is
moving:
Check the circuits in
the vicinity of IC561
pins 8 and 9.
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 6 and 7?
NO
Is 4V present at IC521
pin 41?
NO
Check IC521.
Does the RF signal
appear at IC501 pin 19?
YES
YES
Check the spindle motor
and its wiring.
Is the RF waveform at
IC501 pin 5 distorted?
Proceed to the Tracking
section
Check the circuits in
the vicinity of IC501
pin 5 or the pickup.
YES
Check the vicinity of
IC561.
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at
IC561 pins 10 and 11?
YES
Check IC521.
Check the circuits in
the vicinity of IC561
pins 2 to 11.
NO
Check the pickup and
its connections.
NO
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