JVC KD-S620 Service Manual page 11

Feed Section
Is the voltage output at
IC521 pin "53" 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
IC581 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:
Approx. 1.2 V
Is the tracking error signal
output at IC501 "12"?
YES
Check IC521.
NO
Is the wiring for IC521
(90) ~ (100) correct?
NO
NO
Is 6V or 2V present at
IC581 "5" and "6"?
NO
Check IC581.
NO
Check the circuits in
the vicinity of IC581
pins "15" ~ "18".
YES
YES
Check the pickup and
its connections.
NO
Is 4V present at IC581
pins "7" and "8" ?
YES
Check the spindle motor
and its wiring.
NO
Check the circuits in the
vicinity of IC501 "19" ~
NO
"24" or the pickup
YES
Check the circuit in the
vicinity of IC501 pins
"2" ~ "12".
YES
Is 5V present at IC581
pin "11"?
YES
Check the vicinity of
IC521.
YES
Check the feed motor
connection wiring.
NO
Is 4V present at IC521
pin "55" ?
YES
Check the vicinity of
IC581.
YES
Check the pickup and
KD-S570/KD-S620
NO
Check CD 9V
and 5V.
NO
Check IC501 and
IC521.
its connections.
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