JVC KD-S845 Service Manual page 14

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3.2.1 Feed section
Is the voltage output at
IC541 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?
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L 13942296513
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:
Is the tracking error signal
output at IC521 "11"?
Check IC541.
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NO
Is the wiring for IC541
pin 27?
NO
NO
Is 6V or 2V present at
IC501 "6" and "7"?
NO
Check IC501.
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC501 pins "8" and "9"?
NO
Is 4V present at IC501
pins "3" and "4"?
YES
Check the spindle motor
and its wiring
NO
Check the circuits in the
vicinity of IC521 "6"to
NO
"7" or the pickup
Check the circuit in the
YES
vicinity of IC521 pins
"2"~"7".
Approx. 1.2V
YES
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8
YES
Is 3.3V present at IC501
pin "20"?
Check the vicinity of
IC541.
YES
Check the feed motor
connection wiring.
NO
Check the circuits in
the vicinity of IC501
pins"15"and"16".
YES
Check the pickup and
YES
its connections
NO
Is 4V present at IC541
pins "41" ?
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3 6 7 1 3
Check the vicinity of
IC501.
YES
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2 9 9 4 2 8
NO
YES
Check CD 8V
and 5V.
NO
1 5 0 5 8 2 9 9 4
YES
Check IC541
Check the pickup and
its connections
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9 9
2 8 9 9