Troubleshooting - Jvc Kd-G151 Service Manual

QQ
3 7 63 1515 0
5.1 Feed section
Is the voltage output at
IC521 pin 40, 5V or 0V?
YES
Is 4V present at both
sides of the feed motor?
YES
Check the feed motor.
5.2 Focus section
TE
L 13942296513
5.3 Spindle section
Is the disk rotated?
YES
Does the RF signal
appear at RF test point?
YES
Is the RF waveform
at RF test point
distorted?
YES
Proceed to the Tracking
section.
5.4 Tracking section
When the disc is rotated
at first:
www
Is the tracking error
signal output at
TE test point?
.
Check IC521.
1-26 (No.MA145)
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SECTION 5

TROUBLESHOOTING

NO
Is the wiring for IC521
pin 40 correct?
NO
NO
Is 6V or 2V present at
IC561 pins 4 and 5?
NO
Check IC561.
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC561 pins 8 and 9?
YES
NO
Is 4V present between
IC561 pins 6 and 7?
YES
Check the spindle motor
and its wiring.
NO Check the circuits in
the vicinity of IC501
pin 19 or the pickup.
NO
Check the circuits in
NO
the vicinity of IC501
pins 2 to 12.
Approx. 1.2V
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i
YES
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2 9
8
YES
Is 5V present at IC561
pins 3,12 and 21?
YES
Check the vicinity of
IC521.
YES
Check the feed motor
connection wiring.
Check the circuits in
NO
the vicinity of IC561
pins 15 and 16.
YES
Check the pickup and
Q Q
3 6 7 1 3 1 5
its connections.
NO
Is 4V present at IC521
pin 41?
YES
Check the vicinity of
IC561.
NO
Check the pickup and
its connections.
co
.
9 4 2 8
NO
Check CD 8V.
0 5 8 2 9 9 4 2 8
NO
Check IC521.
m
9 9
9 9