(No.MA074)1-25
SECTION 5
TROUBLE SHOOTING
5.1
Feed section
5.2
Focus section
5.3
Spindle section
Check the feed motor.
Is 4V present at both
sides of the feed motor?
Is the wiring for IC541
pin 40 correct?
NO
YES
YES
Is the voltage output at
IC541 pin 40 5v or 0V
NO
Is 6V or 2V present at
IC501 pins 4 and 5?
NO
Check IC501.
YES
YES
Is 5V present at IC501
pins 3,12 and 21?
Check the feed motor
connection wiring.
YES
Check the vicinity of
IC541.
NO
Check CD 8V.
NO
When the lens is
moving:
Check the circuits in
the vicinity of IC501
pins 8 and 9.
Does the S-search
waveform appear at
IC501 pins 8 and 9?
4V
YES
NO
YES
Check the pickup and
its connections.
Is the disk rotated?
YES
NO
Is 4V present between
IC501 pins 6 and 7?
NO
Is 4V present at IC541
pin 41?
NO
Check IC541.
Does the RF signal
appear at IC521 pin 19?
YES
YES
Check the spindle motor
and its wiring.
Is the RF waveform
at IC521 pin 19
distorted?
Proceed to the Tracking
section
Check the circuits in
the vicinity of IC521
pin 19 or the pickup.
NO
NO
YES
Check the vicinity of
IC501
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at
IC521 pin 11?
YES
Check IC541.
Check the circuits in
the vicinity of IC501
pins 2 to 11.
NO
Check the pickup and
its connections.
NO
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
