1-26 (No.MA218)
5.3
Spindle section
5.4
Tracking section
Is the disk rotated?
NO
YES
Is 4V present between
pin 15 and pin 16 of IC681?
Does the RF signal
appear at IC601 pin 19?
YES
Check the spindle motor
and its wiring.
Is the RF waveform at
IC601 pin 19 distorted?
Proceed to the Tracking
section
Check the circuits in
the vicinity of IC601
or the pickup.
YES
NO
NO
YES
NO
Is the voltage input at pin
25 and pin 26 of IC681?
Is the power supply
present at pin 10 and
pin 19 of IC681?
YES
YES
NO
Check the connections
of CD8V power supply.
Check IC681.
NO
Is the voltage output at
pin 41 of IC621?
Check the connections
between IC681 and
IC621.
YES
NO
YES
Check IC621.
NO
Check the connections
of CD8V power supply.
Is the power supply
present at pin 5, pin 15,
pin 25 and pin 43 of
IC621?
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at IC601
pin 10 and pin 11?
Check the circuits in
IC601 or the vicinity
of IC601.
Replace IC601 or repair
the malfunction
connection point
YES
Check IC621.
NO
Check the pickup and
its connections.
YES
NO
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