KD-SX9350,KD-SX990
(No.49781)1-25
3.3 Troubleshooting
3.3.1 Feed section
3.3.2 Focus section
3.3.3 Spindle section
Is the voltage output at
IC521 pin "40" 5V or 0V?
Check the feed motor.
Is 4V present at both
sides of the feed motor?
Check IC561.
Is 6V or 2V present at
IC561 "4" and "5"?
Is 3.3V present at IC561
pin "20"?
Check the feed motor
connection wiring.
Check the vicinity of
IC521.
Check CD 8V
and 5V.
YES
YES
YES
NO
NO
NO
NO
YES
YES
Is the wiring for IC521
(56) ~ (64) correct?
When the lens is
moving:
Check the circuits in
the vicinity of IC561
pins "8","9"and"15".
Check the pickup and
its connections.
NO
YES
YES
Does the S-search
wave form appear at
IC561 pins "8" and "9"?
4V
Is the disk rotated?
Does the RF signal
appear at TP1?
Is 4V present at IC561
pins "6" and "7"?
Check the spindle motor
and its wiring.
Is 4V present at IC521
pin "41"?
Check the vicinity of
IC561.
Check IC521 and
IC501.
YES
NO
NO
NO
NO
NO
YES
YES
YES
Check the circuits in the
vicinity of IC501 "19"~
"24" or the pickup
Is the RF waveform at TP1
Check the circuit in the
vicinity of IC501 pins
"2" ~ "12".
Check IC521.
Check the pickup and
its connections
YES
YES
YES
Approx. 1.2V
Is the tracking error signal
output at IC501 "11"?
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