Epson FX-870 Service Manual page 152

Table 6-8. Repairing the C094 MAIN Board Assembly (Continued)
Problem Symptom
Paper feed The printer
does not feed defective.
abnormal.
the paper at
all or the
paper feed is
irregular.
Incorrect
Data is
printing of
corrupted
data sent when the
from the
p a r a l l e l
host
interface is
computer.
used.
Epson FX-87011170
Cause
Check the input signal (pin 2) and the output
waveform (pin 3).
Either IC4 or
defective.
Principles of Operation
Checkpoint
Solution
Replace ICl
Replace IC4
or IC5.
6-37