JVC KD-LX10 Service Manual page 24

KD-LX10/KD-LX30
Feed Section
Is the voltage output at
IC631 pin "26" 2.5V or
YES
Is 4V present at both
sides of the feed motor?
YES
Check the feed motor.
Focus Section
When the lens is
moving:
Does the S-search
waveform appear at
IC601 pins "17" and "18"?
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 IC631 "33"?
Check IC601.
2-22
NO
Is the wiring for IC941
(10) ~ (15) correct?
NO
NO
Is 6V or 2V present at
IC601 "26" and "27"?
NO
Check IC661.
NO
Check the circuits in
the vicinity of IC661
pins "17" ~ "20".
YES
Check the pickup and
its connections.
NO
Is 3.5V present at IC661
pins "1" and "2" ?
Check the spindle motor
and its wiring.
NO
Check the circuits in the
vicinity of IC601 "10" ~
NO
"18" or the pickup
YES
Approx. 1.2 V
YES
YES
Is 5V present at IC601
Check the vicinity of
YES
Check the feed motor
connection wiring.
YES
NO
Is 4V present at IC631
pin "25" ?
YES
Check the vicinity of
Check the circuit in the
vicinity of IC601 pins
"20" ~ .
NO
Check CD 9V
pin "5"?
YES
IC941.
NO
Check IC601 and
YES
IC661.
YES
Check the pickup and
its connections.
and 5V.
IC631.