JVC KW-TC410, Service Manual

Page: 16 / 47

1-16 (No.MA244)
SECTION 5
TROUBLESHOOTING
5.1 Feed section
5.2 Focus section
Check the feed motor.
Is the voltage 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, pin 19 and pin 28
of IC681?
Check the connections
between the feed motor and
IC681.
YES
NO
Is the voltage input at 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 6, pin 15, pin 25, pin 39,
pin 43, pin 48, pin 51 and pin
64 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 pin 13 and
pin 14?
4V Check the pickup and
its connections.
YES
NO
Is the voltage input at pin 1
and pin 2 of IC681?
YES YES
NO
Is the voltage output at pin 33
of IC621?
NO
YES
Check IC681.
Is the power supply present
at pin 10, pin 19 and pin 28
of IC681?
NO
Check the connections of
CD8V power supply.
Is the power supply present
at pin 6, pin 15, pin 25, pin 39,
pin 43, pin 48, pin 51 and pin
64 of IC621?
YES
Check IC621.
NO
Check the connections of
CD8V power supply.
Check the connections
between IC681 and IC621.