1-18 (No.MA233)
5.2.3 Spindle section
5.2.4 Tracking section
Is the disk rotated?
NO
YES
Is the voltage output at
pin 6 and pin 7 of IC501?
Does the RF signal appear
at pin 39 of IC521?
YES
Check the spindle motor
and its wiring.
Is the RF waveform at
pin 39 of IC521 distorted?
Proceed to the Tracking
section
Check the circuits in
the vicinity of IC521
or the pickup.
YES
NO
NO
YES
NO
Is the voltage input at pin
17 of IC501?
YES
NO
Is the voltage output at
pin 5 of IC521?
Check the connections
between IC501 and
IC521.
YES
NO
Is the power supply
present at pin 3, pin 12
and pin 21 of IC501?
YES
Check IC501.
NO
Check the connections
of CD8V power supply.
Is the power supply
present at pin 16, pin 37,
pin 49, pin 53, pin 56
and pin 72 of IC521?
YES
Check IC521.
NO
Check the connections
of CD8V power supply.
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at pin 26
of IC521?
Replace IC521 or repair
the malfunction
connection point
YES
NO
Check the pickup and
its connections.
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