JVC KD-AR470 Service Manual page 17

5.2 Trouble shooting (For KD-G521 and KD-G527)
5.2.1 Feed section
Is 4V present at both
sides of the feed motor?
Is the voltage output at
pin 4 and pin 5 of IC501?
Is the voltage input at pin
27 of IC501?
Is the voltage output at pin
40 of IC541?
Is the power supply
present at pin 6, pin 15,
pin 25, pin 39, pin 43,
pin 51 and pin 64 of IC541?
Check the connections
of CD8V power supply.
5.2.2 Focus section
When the lens is
moving:
Does the S-search
waveform appear at
IC501 pins 8 and 9?
Is the voltage input at pin
15 of IC501?
Is the voltage output at
pin 33 of IC541?
Is the power supply
present at pin 6, pin 15,
pin 25, pin 39, pin 43,
pin 51 and pin 64 of IC541?
Check the connections
of CD8V power supply.
YES
Check the feed motor.
NO
Check the connections
YES
between the feed motor
and IC501.
NO
Is the power supply
YES
present at pin 3, pin 12
and pin 21 of IC501?
Check the connections
of CD8V power supply.
NO
Check the connections
YES
between IC501 and
IC541.
NO
YES
Check IC541.
NO
YES
Check the pickup and
4V
its connections.
NO
Is the power supply
YES
present at pin 3, pin 12
and pin 21 of IC501?
Check the connections
of CD8V power supply.
NO
Check the connections
YES
between IC501 and
IC541.
NO
YES
Check IC541.
NO
YES
Check IC501.
NO
YES
Check IC501.
NO
(No.MA232)1-17