Epson FX-870 Service Manual page 150

Table 6-8. Repairing the C094 MAIN Board Assembly (Continued)
Problem Symptom
The CPU
Abnormal
operation at does not
operate
power on.
properly.
Carriage The
operation
carriage
abnormal. does not
operate at
all.
Epson FX-870/1170
Cause
The CPU is Check the oscillator signal (IC2Cl pin 27 or
defective. pin 28).
IC6 is Check the input signal (pin 5) and the output
defective.
waveform (pin, 8).
Checkpoint
Principles of Operation
Solution
If the signal is
not correct,
replace
Otherwise,
replace CRl.
Replace IC6.
6-35