1-28 (No.49787B)
Feed section (new circuit board)
Focus section (new circuit board)
Spindle section (new circuit board)
Tracking section (new circuit board)
Is the voltage output at
IC521 pin 40 3.3V or 0V?
Check the feed motor.
Is 4V present at both
sides of the feed motor?
Is the wiring for IC521
(57) (63) correct?
Check IC581.
Is 6V or 2V present at
IC581 17 and 18?
Is 5V present at IC581
pin 33?
Check the feed motor
connection wiring.
Check the vicinity of
IC521.
Check CD 9V
and 5V.
YES
YES
YES
NONO
NO
NO
YES
YES
When the lens is
moving:
Check the circuits in
the vicinity of IC581
pins 10,21,22
Check the pickup and
its connections.
NO
YES
YES
Does the S-search
waveform appear at
IC581 pins 21 and 22?
4V
Is the disk rotated?
Does the RF signal
appear at TP1?
Is 4V present between
IC581 pins 15 and 16?
Check the spindle motor
and its wiring.
Is 3.3V present at
IC521 pin 41?
Check the vicinity of
IC581.
Check IC501 and
IC521.
YES
NO
NO
NO
NO NO
YES
YES
YES
Check the circuits in the
vicinity of IC501 19 to 24
or the pickup
Is the RF waveform at
TP1 distorted?
Proceed to the Tracking
section
When the disc is rotated
at first:
Check the circuit in the
vicinity of IC501 pins 2
to 12.
Check IC521.
Check the pickup and
its connections.
YESYES
YES
Is the tracking error
signal output at IC501
pin11?
Approx. 1.0 V
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2
8
9
4
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9
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L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
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2
9
8
0
5
1
5
1
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6
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Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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