JVC KW-XC88 Service Manual page 33

QQ
5.2 Feed section 3 7 63 1515 0
Is the voltage output at
IC621 pin "40" 5V or 0V?
YES
Is 4V present at both
sides of the feed motor?
YES
Check the feed motor.
5.3 Focus section
5.4 Spindle section
TE Is the disk rotated?
L 13942296513
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
5.5 Tracking section
When the disc is rotated
Is the tracking error signal
output at IC661 "37"?
www
Check IC621.
.
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NO
Is the wiring for IC621
(56)~(64) correct?
NO
Is 6V or 2V present at
IC661 "31" and "32"?
Check IC661.
When the lens is
moving:
Does the S-search
waveform appear at
IC661 pins "38" and "39"?
NO
Is 4V present at IC661
pins "33" and "34"?
Check the spindle motor
and its wiring
NO
Check the circuits in the
vicinity of IC661 "40"~
NO
"45" or the pickup
at first:
NO
Approx. 1.2V
YES
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8
YES
Is 3.3V present at IC621
NO
Check the vicinity of
YES
Check the feed motor
connection wiring.
NO
NO
Check the circuits in
the vicinity of IC661
pins "38","39"and"48".
4V
Check the pickup and
YES
its connections
NO
Is 4V present at IC621
Q Q
3 6 7 1 3
YES
Check the vicinity of
Check the circuit in the
vicinity of IC661 pins
"40"~"45".
u163
.
2 9 9 4 2 8
NO
pin "6"?
YES
Check CD 8V
IC621.
YES
NO
1 5 0 5 8 2 9 9 4
pins "41" ?
YES
IC661.
Check IC621 and
Check the pickup and
YES
its connections
m
co
9 9
and 5V.
2 8 9 9
IC661.
(No.MA099)1-33