JVC KD-G465 Servise Manual page 28

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5.2 KD-G465 UT2,UH2,UN2,U2 version model 3 7 63 1515 0
5.2.1 Feed section
Is 5V or 0V at IC521
pin 7?
YES
Is 4V present at both
sides of the feed motor?
YES
Check the feed motor.
5.2.2 Focus section
5.2.3 Spindle section
TE
L 13942296513
Is the disk rotated?
YES
Does the RF signal
appear at ARF test point?
YES
Is the RF waveform at
ARF test point distorted?
YES
Proceed to the Tracking
section
5.2.4 Tracking section
When the disc is rotated
at first:
Is the tracking error
signal output at IC521
pin 25?
www
Check IC521.
.
1-28 (No.MA137)
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NO
Is the wiring for IC521
pin 7 correct?
NO
NO
Is 6V or 2V present at
IC501 pins 17 and 18?
NO
Check IC501.
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC501 pins 9 and 10?
YES
NO
Is 4V present between
IC501 pins 15 and 16?
YES
Check the spindle motor
and its wiring.
NO
Check the circuits in
the vicinity of IC521 pins
28 to 35 or the pickup.
NO
Check the circuits in
NO
the vicinity of IC521
pins 28 to 35.
Approx. 1.2V
YES
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2 9
8
YES
Is 5V present at IC501
pin 7?
YES
Check the vicinity of
IC521.
YES
Check the feed motor
connection wiring.
Check the circuits in
NO
the vicinity of IC501
pin 26.
YES
Check the pickup and
its connections.
Q Q
3 6 7 1 3 1 5
NO
Is 4V present at IC521
pin 5?
YES
Check the vicinity of
IC501.
NO
Check the pickup and
its connections.
co
.
9 4 2 8
NO
Check CD8V.
0 5 8 2 9 9 4 2 8
NO
Check IC521.
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9 9
9 9