LG CM4520 Service Manual

CD FUNCTION
YES
Can the
disc insert?
NO
Is Motor_open/close
OK? (IC301 Pin10,11)
NO
Refer to function
check.
YES
Disc reading
is ok?
Is no signal at spk?
YES
Is Motor ok?
(about 12 Ω)
Is load +,- ok?
YES
Check
the signal of
IC302 Pin34,35,36.
NO
YES
Check
the signal (16.0344 MHz)
of IC302
Pin31.
NO
YES
Check IC801
input/output and
control line.
NO
YES
YES
Check loading motor.
NO
OPU driving (Focus
and tracking) is ok?
NO
Focus/
tracking/sled signal
is ok?
NO
Check IC301
(Motor drive IC).
NO
Is the PD(CN301
Pin22) about 190 mV?
YES
Check Vcc of IC302.
Check Cristal (X301).
NO
Replace Cristal
(X301).
Replace IC801.
Check IC301.
YES
1. CD FUNCTION
Check IM
(pick-up).
NO
3-27
CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

LG CM4520 Specifications

General

Brand	LG
Model	CM4520
Category	Stereo System
Language	English