(No.MA232)1-15
5.1.3 Spindle section
5.1.4 Tracking section
Is the disk rotated?
NO
YES
Is the voltage output at
pin 15 and pin 15 of IC681?
Does the RF signal appear
at RF output of IC601?
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 IC601
or the pickup.
YES
NO
NO
YES
NO
Is the voltage input at pin
26 of IC681?
YES
NO
Check the connections
of CD8V power supply.
NO
Is the voltage output at pin
41 of IC621?
Check the connections
between IC621 and
IC681.
YES
NO
YES
Check IC621.
NO
Check the connections
of CD8V power supply.
Is the power supply
present at pin 10, pin 19
and pin 28 of IC681?
YES
Check IC681.
Is the power supply
present at pin 6, pin 15,
pin 25, pin 39, pin 43,
pin 51 and pin 64 of IC621?
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at pin 11
of IC601?
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
