(No.MA123)1-27
5.2
KD-S31 J2 version model
5.2.1 Feed section
5.2.2 Focus section
5.2.3 Spindle section
Check the feed motor.
Is 4V present at both
sides of the feed motor?
Is the wiring for IC521
pin 7 correct?
NO
YES
YES
Is 5v or 0V at IC521
pin 7?
NO
Is 6V or 2V present at
IC501 pins 17 and 18?
NO
Check IC501.
YES
YES
Is 5V present at IC501
pin 7?
Check the feed motor
connection wiring.
YES
Check the vicinity of
IC521.
NO
Check CD8V.
NO
When the lens is
moving:
Check the circuits in
the vicinity of IC501
pin 26.
Does the S-search
waveform appear at
IC501 pins 9 and 10?
4V
YES
NO
YES
Check the pickup and
its connections.
Is the disk rotated?
YES
NO
Is 4V present between
IC501 pins 15 and 16?
NO
Is 4V present at IC521
pin 5?
NO
Check IC521.
Does the RF signal
appear at ARF test point?
YES
YES
Check the spindle motor
and its wiring.
Is the RF waveform at
ARF test point distorted?
Proceed to the Tracking
section
Check the circuits in
the vicinity of IC521 pins
28 to 35 or the pickup.
NO
NO
YES
Check the vicinity of
IC501.
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at IC521
pin 25?
YES
Check IC521.
Check the circuits in
the vicinity of IC521
pins 28 to 35.
NO
Check the pickup and
its connections.
NO
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