Troubleshooting - JVC KD-G120 Service Manual

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5.1 Trouble shooting (For KD-G120, KD-G120R, KD-G123, KD-G124,KD-G125 and KD-G126)
5.1.1 Feed section
Is 4V present at both
sides of the feed motor?
Is the voltage output at
pin 4 and pin 5 of IC541?
Is the voltage input at pin
28 of IC541?
Is the voltage output at pin
21 and pin 22 of IC561?
Is the power supply
present at pin 4, pin 50,
pin 60 and pin 72 of IC561?
Check the connections
TE
L 13942296513
of CD8V power supply.
5.1.2 Focus section
When the lens is
moving:
Does the S-search
waveform appear at
IC541 pins 8 and 9?
Is the voltage input at pin
15 of IC541?
Is the voltage output at
pin 28 of IC561?
Is the power supply
www
present at pin 4, pin 50,
pin 60 and pin 72 of IC561?
.
Check the connections
of CD8V power supply.
1-14 (No.MA233)
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SECTION 5

TROUBLESHOOTING

YES
Check the feed motor.
NO
Check the connections
YES
between the feed motor
and IC541.
NO
Is the power supply
YES
present at pin 3, pin 12
and pin 21 of IC541?
Check the connections
of CD8V power supply.
NO
Check the connections
YES
between IC541 and
IC561.
NO
YES
Check IC561.
NO
YES
Check the pickup and
4V
its connections.
NO
Is the power supply
YES
present at pin 3, pin 12
and pin 21 of IC541?
Check the connections
of CD8V power supply.
NO
Check the connections
YES
between IC541 and
IC561.
NO
YES
Check IC561.
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y
NO
i
http://www.xiaoyu163.com
2 9
8
YES
Check IC541.
NO
Q Q
3 6 7 1 3 1 5
YES
Check IC541.
NO
co
.
9 4 2 8
0 5 8 2 9 9 4 2 8
m
9 9
9 9