LG CRD-8402B Service Manual page 6

B. Pick-Up doesn't move to the inner track.
Do the signals appear at
IC401 pin , ?
94 95
(Refer to Fig. B-1.)
YES
Does "H" output at IC201
pin ?
41
YES
Is the 1.4V at IC201 pin
YES
Do the signals appear in
PN301 pin?
(Refer to Fig. B-2.)
YES
Check the PN301, and then
replace the Sled Motor.
CH1
PIN94
DA0
CH2
PIN95
DA1
Fig. B-1. DA0 and DA1 Signals
22
NO
Check IC401.
NO
Check the pattern from
IC401 pin
pin .
41
Check the R290, R291
NO
?
and C290 and then
25
replace IC103.
NO
Replace IC201.
to IC201
5
CH1 TP4
CH2 TP5
CH3 TP6
CH4 TP7
Fig. B-2. TP4, TP5, TP6 and TP7 Signals