(No.MA218)1-25
SECTION 5
TROUBLESHOOTING
5.1
Feed section
5.2
Focus section
Check the feed motor.
Is 4V present at both
sides of the feed motor?
YES
NO
Is the voltage output at pin
17 and pin 18 of IC681?
Is the power supply
present at pin 10 and
pin 19 of IC681?
Check the connections
between the feed motor
and IC681.
YES
NO
Is the voltage input at pin
23 and pin 24 of IC681?
YES
YES
Check IC681.
NO
Check the connections
of CD8V power supply.
NO
Is the voltage output at pin
40 of IC621?
Check the connections
between IC681 and
IC621.
YES
NO
Is the power supply
present at pin 5, pin 15,
pin 25 and pin 43 of
IC621?
YES
Check IC621.
NO
Check the connections
of CD8V power supply.
When the lens is moving:
Does the S-search
waveform appear at
IC681 pins 13 and 14?
4V
Check the pickup and
its connections.
YES
NO
Is the power supply
present at pin 10 and
pin 19 of IC681?
Is the voltage input at pin
1 and pin 2 of IC681?
YES
YES
NO
Check the connections
of CD8V power supply.
NO
Is the voltage output at
pin 33 of IC621?
NO
YES
Check the connections
between IC681 and
IC621.
Check IC681.
YES
Check IC621.
NO
Check the connections
of CD8V power supply.
Is the power supply
present at pin 5, pin 15,
pin 25 and pin 43 of IC621?
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