Cd Function Check - LG CM2460 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

8. CD FUNCTION CHECK

CD FUNCTION
YES
Can the
disc insert?
YES
Disc reading
is ok?
YES
Is no signal at spk?
YES
Check
the signal of IC800
pin34, 35, 36.
YES
Check
the signal (16.934 MHz)
at IC800 pin48, 49.
YES
Check IC105
input/output and
control line.
YES
Refer to function check.
NO
Is load +,- ok?
Is Motor ok? (about 12 Ω)
NO
IM driving
(Focus and tracking) is ok?
NO
Check Vcc of IC800.
NO
Check Cristal (X800).
NO
Replace IC105.
3-25
NO
YES
NO
NO
NO
Is Motor_open/close ok?
(IC801 pin6, 7)
YES
Check IC801.
Check loading motor.
Check IC801 (Motor drive IC).
NO
Focus,
tracking, sled signal
is ok?
YES
Is the MD (PN800 pin5)
about 190 mV?
NO
Check IM (pick-up).
Replace Cristal (X800).