JVC KD-LH3150 Service Manual page 25

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3.2.1 Feed section
Is the voltage output at
IC621 pin "40" 5V or 0V?
Is 4V present at both
sides of the feed motor?
Check the feed motor.
3.2.2 Focus section
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC681 pins "13" and "14"?
3.2.3 Spindle section
Is the disk rotated?
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Does the RF signal
appear at IC601 pin "19"?
Is the RF waveform at
IC601 pin "19" distorted?
Proceed to the Tracking
section
3.2.4 Tracking section
When the disc is rotated
at first:
Is the tracking error signal
output at IC601 "11"?
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NO
Is the wiring for IC621
pin "40"?
YES
NO
Is 6V or 2V present at
IC681 "16" and "17"?
YES
Check IC681.
NO
Check the circuits in
the vicinity of IC681
pins "13","14"and"1".
YES
YES
Check the pickup and
its connections
NO
Is 4V present at IC681
pins "15" and "16"?
YES
Check the spindle motor
and its wiring
YES
NO
Check the circuits in the
vicinity of IC601 pin "19"
NO
or the pickup
YES
YES
Approx. 1.2V
YES
Check IC621.
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YES
Is 3.3V present at IC681
pin "6"?
NO
Check the vicinity of
IC621.
YES
Check the feed motor
connection wiring.
NO
NO
Is 4V present at IC621
pins "41" ?
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YES
Check the vicinity of
IC681.
Check the circuit in the
YES
vicinity of IC601 pins
"2" to "7".
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2 9 9 4 2 8
NO
YES
Check CD 8V
and 5V.
NO
YES
1 5 0 5 8 2 9 9 4
Check the circuits in
the vicinity of IC621
or IC621
Check the pickup and
its connections
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KD-LH3150, KD-LH3100
9 9
2 8 9 9
(No.49838)1-25