JVC KD-S52 Service Manual page 26

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5.3 Spindle section 3 7 63 1515 0
Is the disk rotated?
NO
Is 4V present between
pin 15 and pin 16 of IC681?
NO
Is the voltage input at pin
25 and pin 26 of IC681?
NO
Is the voltage output at
pin 41 of IC621?
NO
Is the power supply
present at pin 5, pin 15,
pin 25 and pin 43 of
IC621?
TE
NO
L 13942296513
Check the connections
of CD8V power supply.
5.4 Tracking section
www
.
1-26 (No.MA218)
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YES
Does the RF signal
appear at IC601 pin 19?
YES
Check the spindle motor
and its wiring.
Is the power supply
YES
present at pin 10 and
pin 19 of IC681?
NO
Check the connections
of CD8V power supply.
Check the connections
YES
between IC681 and
IC621.
YES
Check IC621.
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at IC601
pin 10 and pin 11 ?
NO
Check the circuits in
IC601 or the vicinity
of IC601.
NO
Replace IC601 or repair
the malfunction
connection point
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2 9
8
YES
Is the RF waveform at
IC601 pin 19 distorted?
NO NO
Check the circuits in
the vicinity of IC601
or the pickup.
YES
Check IC681.
Q Q
3 6 7 1 3 1 5
YES
Check IC621.
YES
Check the pickup and
its connections.
co
.
9 4 2 8
YES
Proceed to the Tracking
section
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