TROUBLESHOOTING
REV.-A
Table 5-7. SAMS Board Unit Repair (Cont.)
Problem
Symptom Cause
Checkpoint
Solution
Paper is not Paper feed
Paper feed
Check the paper-feed motor drive signal and paper-feed Replace the
fed normally. pitch is
motor drive motor drive transistor.
paper-feed
abnormal
transistor is
motor drive
(open-
defective.
transistor.
phase).
Printing in
on-line
node is
abnormal.
Paper-feed motor drive transistor collector
Paper does
Q27 or IC8B Check transistor Q27.
not feed, or
is defective.
feed pitch is
abnormal
(lack of
torque).
Data
IC7A or
Check input/output signals of IC7A or IC7B.
corruption
IC7B is
occurs when defective.
the parallel
interface is
used.
Replace
Q27.
Replace
IC7A or
IC7B.
5-20
LQ-510
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