LG OK75 User Manual

3-32
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Only for training and service purposes.
ELECTRICAL TROUBLESHOOTING GUIDE
8. CD FUNCTION CHECK
CD FUNCTION
Is motor_open/close ok?
(IC400 pin6, 7)
Replace cristal (X400).
Check loading motor.
Check IC400.
Check IC400 (Motor drive IC).
Is the MD (PN401 pin22)
about 190 mV?
Check MD (pick-up).
IM driving
(Focus and tracking) is ok?
Check Vcc of IC401.
Replace IC501.
Check cristal (X400).
Is motor ok? (about 12 Ω)
Is no signal at speaker?
Can the
disc insert?
Disc reading
is ok?
Check
the signal of IC401.
Check IC501
input/output and
control line.
Check
the signal (16.9344 MHz)
at IC401 pin49.
Focus,
tracking, sled signal
is ok?
Is load +,- ok?
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
NO
Refer to function check.

LG OK75 Specifications

General

Output Power	1000W
Bluetooth	Yes
Karaoke Creator	Yes
DJ Effects	Yes
USB Playback	Yes
Multi Jukebox	Yes
Party Accelerator	Yes
Type	Mini Hi-Fi System
Audio Playback	MP3, WMA
FM Radio	Yes
CD Player	Yes
Brand	LG
Model	OK75
Category	Stereo System
Disc Formats	CD, CD-R, CD-RW
Radio	FM
Audio Inputs	USB
Speaker Configuration	2.0 Channel