Epson LQ-510 - Page 184

REV.-A
TROUBLESHOOTING
Problem
Self-test
printing
abnormal.
Symptom
A particular
dot is not
being
printed.
Table 5-7. SAMA Board Unit Repair (Cont.)
Cause
IC1A is
defective.
A printhead
drive tran-
sistor is
defective.
Checkpoint
Check the printhead drive signal at IC1A.
Check the printhead drive transistor corresponding
to the dot.
Head drive transistor collector
Solution
Replace
IC1A.
Replace the
printhead
drive
transistor.
LQ-510
5-19