JVC KW-XC55 - Feed Section Troubleshooting; Focus Section Troubleshooting

(No.49784)1-29
5.3 Feed section
5.4 Focus section
5.5 Spindle section
5.6 Tracking section
Is the voltage output at
IC621 pin "40" 5V or 0V?
Is the wiring for IC621
(56)~(64) correct?
Is 3.3V present at IC621
pin "6"?
Check CD 8V
and 5V.
Check the vicinity of
IC621.
Check the feed motor
connection wiring.
Is 6V or 2V present at
IC661 "31" and "32"?
Check IC661.
Is 4V present at both
sides of the feed motor?
Check the feed motor.
YES
YES
NO YES NO
YES
NO
NO
NO
YES
NO
YES
YES
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC661 pins "38" and "39"?
Check the circuits in
the vicinity of IC661
pins "38","39"and"48".
Check the pickup and
its connections
NO
NO
NO
NO
YES
YES
YES
YES
YES
Is the disk rotated?
Does the RF signal appear
at RF TEST POINT?
Is the RF waveform at RF
TEST POINT distorted?
Proceed to the Tracking
section
Is 4V present at IC661
pins "33" and "34"?
Check the spindle motor
and its wiring
Check the circuits in the
vicinity of IC661 "40"~
"45" or the pickup
Is 4V present at IC621
pins "41" ?
Check IC621 and
IC661.
Check the vicinity of
IC661.
NO
YES
NO YES
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error signal
output at IC661 "37"?
Check IC621.
Check the circuit in the
vicinity of IC661 pins
"40"~"45".
Check the pickup and
its connections
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
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