JVC KD-S12 Service Manual page 26

5.3 Spindle section
Is the disk rotated?
NO
Is 4V present between
pin 6 and pin 7 of IC541?
NO
Is the voltage input at pin
17 and pin 18 of IC541?
NO
Is the voltage output at pin
24 and pin 25 of IC561?
NO
Is the power supply
present at pin 4, pin 50,
pin 60 and pin 72 of
IC561?
NO
Check the connections
of CD8V power supply.
5.4 Tracking section
1-26 (No.MA216)
YES
Does the RF signal
appear at TP RF?
YES
Check the spindle motor
and its wiring.
Is the power supply
YES
present at pin 3, pin 12
and pin 21 of IC541?
NO
Check the connections
of CD8V power supply.
Check the connections
YES
between IC541 and
IC561.
YES
Check IC561.
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at TP TE?
NO
Check the circuits in
IC501 or the vicinity
of IC501.
NO
Replace IC501 or repair
the malfunction
connection point
YES
Is the RF waveform
at TP RF distorted?
NO NO
Check the circuits in
the vicinity of IC501
or the pickup.
YES
Check IC541.
YES
Check IC561.
YES
Check the pickup and
its connections.
YES
Proceed to the Tracking
section