JVC KW-XC828 Service Manual page 32

KW-XC828
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.
Focus section
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC561 pins "8" and "9"?
Spindle section
Is the disk rotated?
YES
Does the RF signal
appear at TP1?
YES
Is the RF waveform at TP1
distorted?
YES
Proceed to the Tracking
section
Tracking section
When the disc is rotated
at first:
Is the tracking error signal
output at IC501 "11"?
Check IC521.
1-32
NO
Is the wiring for IC521
(56)~(64) correct?
NO
NO
Is 6V or 2V present at
IC561 "4" and "5"?
NO
Check IC561.
NO
Check the circuits in
the vicinity of IC561
pins "8","9"and"15".
Check the pickup and
YES
its connections
NO
Is 4V present at IC561
pins "6" and "7"?
YES
Check the spindle motor
and its wiring
NO
Check the circuits in the
vicinity of IC501 "19"~
NO
"24" or the pickup
Check the circuit in the
YES
vicinity of IC501 pins
Approx. 1.2V
YES
YES
Is 3.3V present at IC561
pin "20"?
Check the vicinity of
IC521.
YES
Check the feed motor
connection wiring.
YES
NO
Is 4V present at IC521
pins "41" ?
Check the vicinity of
IC561.
YES
"2"~"12".
NO
YES
Check CD 8V
and 5V.
NO
YES
Check IC521 and
IC501.
Check the pickup and
its connections