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5.1
Feed section
Is the voltage out put at
IC541 pin 40, 5V or 0V?
NO
YES
SECTION 5
8 9 2 4 9 8 2 9 9
YES NO
Is the wiring for IC541 pin 40 correct?
NO
Is 5V present at IC501 pins 3,12 and 21?
YES
Check the vicinity of
IC541.
Check CD8V.
Is 6V or 2V present at
IC501 pins 4 and 5?
NO
YES
Check the feed motor connection wiring.
Check IC501.
Is 4V present at both sides of the feed motor?
NO
YES
Check the feed motor.
5.2
Focus section
When the lens is moving:
NO Check the circuits in the vicinity of IC501 pins 15 and 16.
4V
Does the S-search waveform appear at
IC501 pins 8 and 9?
YES
Is the disk rotated?
NO
YES Q Q
NO
Is 4V present between
IC501 pins 6 and 7?
Check the pickup and
3 its connections.
7 6 3 1 5 1 5 0
Is 4V present at IC541 pin 41?
NO
8 9 2 4 9 8 2 9 9
Check IC541.
YES
Does the RF signal appear at RF test point?
YES
Check the spindle motor and its wiring.
YES
Is the RF waveform at RF test point distorted?
NO
NO
Check the circuits in the vicinity of IC521 pin
19 or the pickup.
YES
Proceed to the Tracking section.
5.4
Tracking section
YES
Check the vicinity of
IC501.
When the disc is rotated at first:
NO
Approx. 1.2V
Check the circuits in the vicinity of IC521 pins 2 to 12.
NO Check the pickup and its connections.
Is the tracking error signal output at TE test point?
Check IC541.
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5.5
Signal processing section
Is the sound output from both channels (L, R)?
NO
YES
Normal channel.
NO
8 9 2 defective point.
4 9 8 2 9 9
YES
Is 9V present at IC161 pin 31?
NO
Check the vicinity of the
IC901 audio power supply.
YES
Is the audio signal
(including sampling output components) output to IC581 pins 1 and 7 during playback?
NO
YES
Check IC581 and its peripheral circuits.
Is the audio signal output at IC161 pins 3 and 30 during playback?
NO
YES
Check IC161 and its peripheral circuits.
Check the power amp.
IC301.
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5.6
Maintenance of laser pickup 5.7
Replacement of laser pickup with a alcohol soaked cotton swab.
(2) Life of the laser diode
When the life of the laser diode has expired, the following symptoms will appear.
• The level of RF output (EFM output: amplitude of eye pattern) will be low.
power cord from the ac outlet.
Replace the pickup with a normal one. (Refer to "Removing the pickup unit" on the previous page.)
Is RF output
1.0 0.35Vp-p?
NO
Replace it.
YES
Plug the power cord in, and turn the power on.
At this time, check that the laser emits for about seconds and the objective lens moves up and down.
Note: Do not observe the laser beam directly.
OK
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power.Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the semi-fixed resistor.
If the laser power is lower than the specified value, the laser diode is almost worn out, and the laser pickup should be replaced. If the semi-fixed resistor is adjusted while the pickup is functioning normally, the laser pickup may be
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Play a disc.
Check the eye-pattern at
RF test point.
3 7 6 3 1 5 1 5 0 8 9 2 4 9 8 2 9 9
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(No.MA139)1-29
5.8
16 PIN CORD DIAGRAM
BK
7
6
5
RD
BL
BL/WH
YL
16
OR/WH
15
NC
14
NC
13
4
3
2
1
WH
GN
VI
GY
WH/BK
12
GN/BK
11
VI/BK
10
GY/BK
9 http://www.xiaoyu163.com
BK
RD
Black
8 9 2 4 9
GN Green
8 2 9 9
Red VI Violet
GY Gray BL Blue
WH White YL Yellow
OR Orange
16 YL
8 BK
7 RD
15 OR/WH
3 GN
2 VI
10 VI/BK
4 WH
12 WH/BK
1 GY
9 GY/BK
5 BL/WH
6 BL
MEMORY
GND
ACC
ILL
RL+
RL-
RR+
RR-
FL+
FL-
FR+
FR-
REMOTE
ANT
GND
Q Q 3 7 6 3 1 5 1 5 0 8 9 2 4 9 8 2 9 9
Rear Right
ANT
Auto Antenna
RR
FR
Front Right ACC Line
ACC
Front Left
ILL
Illuminations Control
FL
RL
Rear Left
GND
Ground
REMOTE
Remote out
MEMORY
Memory Backup Battery+ www. xiaoyu163. com
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Victor Company of Japan, Limited
AV & MULTIMEDIA COMPANY CAR ELECTRONICS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.MA139) http://www.xiaoyu163.com
Printed in Japan
VPT
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