Troubleshooting - JVC KD-AR270 Service Manual

5.1 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
28 of IC501?
Is the voltage output at
pin 7 of IC521?
Is the power supply
present at pin 37,
pin 49, pin 53, pin 56
and pin 72 of IC521?
Check the connections
of CD8V power supply.
5.2 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 13 of IC521?
Is the power supply
present at pin 37,
pin 49, pin 53, pin 56
and pin 72 of IC521?
Check the connections
of CD8V power supply.
SECTION 5

TROUBLESHOOTING

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
IC521.
NO
YES
Check IC521.
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
IC521.
NO
YES
Check IC521.
NO
YES
Check IC501.
NO
YES
Check IC501.
NO
(No.MA236)1-17