Cdp Electrical Troubleshooting Guide; Cd Function - LG CMS4750F Service Manual

CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

1. CD FUNCTION

CD FUNCTION
YES
NO
Can the
disc insert?
YES
NO
Disc reading
is ok?
YES
Is no signal at spk?
YES
Check
NO
the signal of
IC407 Pin52,53,54.
YES
Check
NO
the signal (16.0344 MHz)
at IC407
Pin51.
YES
Check IC501
NO
input/output and
control line.
YES
Refer to function
check.
NO
Is load +,- ok?
YES
NO
Is Motor ok?
(about 12 )
NO
IM driving (Focus and
tracking) is ok?
Check Vcc of IC407.
NO
Check Cristal (X400).
Replace IC501.
Is Motor_open/close
OK? (IC408 Pin6,7)
YES
Check IC408.
Check loading motor.
Focus/
tracking/sled signal
is ok?
YES
Is the MD(CN404
Pin22) about 190 mV?
Replace Cristal
(X400).
3-27
NO
Check IC408
(Motor drive IC).
NO
Check IM
(pick-up).