Troubleshooting - JVC KD-S52 Service Manual

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5.1 Feed section
Is the voltage output at pin
17 and pin 18 of IC681?
Is the voltage input at pin
23 and pin 24 of IC681?
Is the voltage output at pin
40 of IC621?
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L 13942296513
5.2 Focus section
When the lens is moving:
Is the voltage input at pin
1 and pin 2 of IC681?
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TROUBLESHOOTING

YES
Is 4V present at both
sides of the feed motor?
NO
YES
NO
YES
NO
YES
NO
Is the power supply
YES
present at pin 5, pin 15,
pin 25 and pin 43 of
IC621?
NO
Check the connections
of CD8V power supply.
YES
4V
Does the S-search
waveform appear at
IC681 pins 13 and 14?
NO
YES
NO
YES
Is the voltage output at
pin 33 of IC621?
NO
Is the power supply
x ao
YES
y
present at pin 5, pin 15,
pin 25 and pin 43 of IC621?
i
NO
Check the connections
of CD8V power supply.
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SECTION 5
8
Check the feed motor.
Check the connections
between the feed motor
and IC681.
Is the power supply
present at pin 10 and
pin 19 of IC681?
NO
Check the connections
of CD8V power supply.
Check the connections
between IC681 and
IC621.
Check IC621.
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3 6 7 1 3
Check the pickup and
its connections.
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
between IC681 and
IC621.
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Check IC621.
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2 9 9 4 2 8
YES
Check IC681.
1 5 0 5 8 2 9 9 4
Check IC681.
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(No.MA218)1-25