Dell GCR-8481B Service Manual page 6

B. Pick-Up doesn't move to the inner track.
Do the signals appear at
IC501 pin , ?
73 74
(Refer to Fig. B-1.)
YES
Does "H" output at IC201
pin ?
41
YES
Is the 1.35V at IC201 pin
25
YES
Do the signals appear in
PN301 pin?
YES
Check the PN301, and then
replace the Sled Motor.
CH1
PIN74
DA0
CH2
PIN73
DA1
Fig. B-1. DA0 and DA1 Signals
NO
Check IC501.
NO
Check the pattern from
IC501 pin
106
pin .
41
NO
Check the R190 and
?
then replace IC102.
NO
Replace IC201.
to IC201
CH1 TP4
CH2 TP5
CH3 TP6
CH4 TP7
Fig. B-2. TP4, TP5, TP6 and TP7 Signals
23