JVC KD-SH1000E, Service Manual

Page: 28 / 77

1-28 (No.MA255)
5.3 Spindle section
5.4 Tracking section
Is the disk rotated?
NO
YES
Is the voltage output at
pin 6 and pin 7 of IC681?
Does the RF signal appear
at pin 83 of IC541?
YES
Check the spindle motor
and its wiring.
Is the RF waveform at
pin 83 of IC541 distorted?
Proceed to the Tracking
section. Check the circuits in
the vicinity of IC541
or the pickup.
YES
NO NO
YES
NO
Is the voltage input at pin
28 of IC681?
YES
NO
Is the voltage output at
pin 58 of IC501?
Check the connections
between IC681 and
IC501.
YES
NO
Is the power supply
present at pin 1, 13, 15,
17 and pin 28 of IC681?
YES
Check IC681.
NO
Check the connections
of CD8V power supply.
YES
Check IC501.
NO
Check the connections
of CD8V power supply.
Is the power supply
present at pins 8,16,25,
28,32,53,71 and pin 90
of IC501?
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at pin 6
of IC681?
Replace IC681 or repair
the malfunction
connection point.
YES
NO
Check the pickup and
its connections.