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3 7 63 1515 0
3.3
Troubleshooting
Feed section
Is the voltage output at
IC621 pin "40" 5V or 0V?
YES
Is 4V present at both
sides of the feed motor?
YES
Check the feed motor.
Focus section
When the lens is
moving:
Does the S-search
waveform appear at
IC681 pins "13" and "14"?
TE
Spindle section
L 13942296513
Is the disk rotated?
YES
Does the RF signal
appear at IC601 pin "19"?
YES
Is the RF waveform at
IC601 pin "19" distorted?
YES
Proceed to the Tracking
section
Tracking section
When the disc is rotated
at first:
www
Is the tracking error signal
output at IC601 "11"?
.
Check IC621.
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NO
Is the wiring for IC621
pin "40"?
NO
Is 6V or 2V present at
IC681 "16" and "17"?
Check IC681.
NO
Check the circuits in
the vicinity of IC681
pins "13","14"and"1".
4V
YES
Check the pickup and
its connections
NO
Is 4V present at IC681
pins "15" and "16"?
Check the spindle motor
and its wiring
NO
Check the circuits in the
vicinity of IC601 pin "19"
NO
or the pickup
YES
Approx. 1.2V
x
ao
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y
i
YES
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2 9
8
YES
Is 3.3V present at IC681
pin "6"?
NO
Check the vicinity of
IC621.
YES
Check the feed motor
connection wiring.
NO
YES
Q Q
3
6 7
1 3
1 5
NO
Is 4V present at IC621
pins "41" ?
YES
Check the vicinity of
IC681.
Check the circuit in the
vicinity of IC601 pins
"2" to "7".
co
.
9 4
2 8
NO
YES
Check CD 8V
and 5V.
0 5
8
2 9
9 4
NO
YES
Check the circuits in
the vicinity of IC621
or IC621
YES
Check the pickup and
its connections
m
9 9
2 8
9 9
(No.49831)1-31
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