1-24 (No.49860)
3.2 Troubleshooting
3.2.1 Feed section
3.2.2 Focus section
3.2.3 Spindle section
Is the voltage output at
IC541 pin 4 is 5V or 0V?
Check the feed motor.
Is 4V present at both
sides of the feed motor?
Is the wiring for IC541
1 ~ 14 correct?
Is 5V present at IC581
pin 6?
Check the feed motor
connection wiring.
Check the vicinity of
IC521.
YES
YES
NO
NO
NO
YES
YES
Check CD 9V
and 5V.
When the lens is
moving:
Check the circuits in
the vicinity of IC541
pins 8 and 9.
Check the pickup and
its connections.
NO
YES
YES
Does the S-search
waveform appear at
IC561 pins 32?
4V
Is the disk rotated?
Does the RF signal
appear at ARF TP?
Is 4V present between
IC541 pins 6 and 7?
Check the spindle motor
and its wiring.
Is 4V present at IC561
pin 29?
Check the vicinity of
IC541.
Check IC561 and
IC901.
YES
NO
NO
NO
NO
YES
YES
Check the circuits in the
vicinity of IC561 21 ~ 40
or the pickup
Is the RF waveform at
Check the circuit in the
vicinity of IC561 pins
21 ~ 40
Check IC501.
Check the pickup and
its connections
YES
YES
YES
Is the tracking error
signal output at TE TP?
Approx. 1.2V
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
