KD-SH707
1-25
Feed section
Focus section
Spindle section
Is the voltage output at
IC521 pin "40" 5V or 0V?
Is the wiring for IC521
(56)~(64) correct?
Is 3.3V present at IC561
pin "20"?
Check CD 8V
and 5V.
Check the vicinity of
IC521.
Check the feed motor
connection wiring.
Is 6V or 2V present at
IC561 "4" and "5"?
Check IC561.
Is 4V present at both
sides of the feed motor?
Check the feed motor.
YES
YES
NO
YES
NO
YES
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC561 pins "8" and "9"?
Check the circuits in
the vicinity of IC561
pins "8","9"and"15".
Check the pickup and
its connections
Is the disk rotated?
Does the RF signal
appear at TP1?
Is the RF waveform at TP1
Is 4V present at IC561
pins "6" and "7"?
Check the spindle motor
and its wiring
Check the circuits in the
vicinity of IC501 "19"~
"24" or the pickup
Is 4V present at IC521
pins "41" ?
Check IC521 and
IC501.
Check the vicinity of
IC561.
Approx. 1.2V
Is the tracking error signal
output at IC501 "11"?
Check IC521.
Check the circuit in the
vicinity of IC501 pins
"2"~"12".
Check the pickup and
its connections
NO
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