JVC KW-XC777 - CD Changer Operations; Playing CDs from Changer

KW-XC777
1-28
Feed Section
Focus Section
Tracking Section
Spindle Section
Is the voltage output at
IC621 pin "40" 5V or 0V?
Check the feed motor.
Is 4V present at both
sides of the feed motor?
Is the wiring for IC621
(56) ~ (64) correct?
Check IC661.
Is 6V or 2V present at
IC661 "8" and "9"?
Is 5V present at IC661
pin "32"?
Check the feed motor
connection wiring.
Check the vicinity of
IC621.
Check CD 9V
and 5V.
YES
YES
YES
NONO
NO
NO
NO
YES
YES
When the lens is
moving:
Check the circuits in
the vicinity of IC661
pins "5","6","47","48".
Check the pickup and
its connections.
NO
YES
YES
YES
Does the S-search
waveform appear at
IC661 pins "5" and "6"?
Is the disk rotated?
Does the RF signal
appear at TP1?
Is 4V present at IC661
pins "33" and "34" ?
Check the spindle motor
and its wiring.
Is 4V present at IC621
pin "41" ?
Check the vicinity of
IC661.
Check IC601 and
IC621.
YES
NO
NO
NO
NO NO
YES
YES
YES
Check the circuits in the
vicinity of IC601 "19" ~ "24"
or the pickup
Is the RF waveform at TP1
distorted?
Proceed to the Tracking
section
When the disc is rotated
at first:
Check the circuit in the
vicinity of IC601 pins
"2" ~ "12".
Check IC521.
Check the pickup and
its connections.
YESYES
YES
Is the tracking error signal
output at IC521 "12"?
Approx. 1.2 V
4V
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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