Epson LQ-510 - Printing Problems and Solutions

TROUBLESHOOTING
REV.-A
Problem
Printer does
operate at
all.
Symptom
CPU is not
operating.
Table 5-7. SAMA Board Unit Repair (Cont.)
Cause
Selection of
control ROM
is abnormal.
Either ROM
or RAM is
defective.
CPU is
defective.
Checkpoint
Check pin 2 of IC7A for a changing signal HIGH/LOW.
Check for oscillator signal at either pin 31 or pin 32 of
he CPU.
Solution
Replace
IC7A.
Replace
either IC6A
or IC5A.
If a signal is
detected,
replace
IC5B. Other-
wise,
replace the
CR1.
5-16
LQ-510