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3.2.1 Feed section
Is the voltage output at
IC621 pin "40" 5V or 0V?
YES
Is 4V present at both
sides of the feed motor?
YES
Check the feed motor.
3.2.2 Focus section
3.2.3 Spindle section
Is the disk rotated?
YES
Does the RF signal
appear at RF test point?
YES
Is the RF waveform at RF
test point distorted?
YES
Proceed to the Tracking
section
3.2.4 Tracking section
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error signal
output at IC681 "9"?
Check IC621.
NO
Is the wiring for IC681
pin 27?
NO
NO
Is 6V or 2V present at
IC681 "4" and "5"?
NO
Check IC681.
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC681 pins "10" and "11"?
NO
Is 4V present at IC681
pins "6" and "7"?
YES
Check the spindle motor
and its wiring
NO
Check the circuits in the
vicinity of IC681 "19"~
NO
"24" or the pickup
Check the circuit in the
YES
vicinity of IC681 pins
"2"~"12".
YES
YES
Is 3.3V present at IC681
pin "20"?
YES
Check the vicinity of
IC621.
YES
Check the feed motor
connection wiring.
NO
Check the circuits in
the vicinity of IC501
pins "8","9"and"15".
YES
Check the pickup and
YES
its connections
NO
Is 4V present at IC621
pins "41" ?
YES
Check the vicinity of
IC681.
YES
KD-LH1150,KD-LH1100
NO
Check CD 8V
and 5V.
NO
Check IC621 and
IC681.
Check the pickup and
its connections
(No.49817)1-25
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