Service manual

Troubleshooting
EPSON FX-880/FX-1180 Service Manual
5-19
Table 5-12. Repairing the C229 Main Board Assembly (continued)
Symptom Condition Possible
Cause
Checkpoint Solution
The printer
does not
operate.
(continued)
The CPU does
not operate.
(continued)
The CPU is
defective.
Check the signal at pin 26 or
27 of IC3 (This is the CPU’s
clock signal.) Pin 28 may be
used as the ground.
Replace the main
board.
Carriage
operation is
abnormal.
The carriage
does not operate.
IC8 is defective. Check the carriage motor
phase control signals at pins
5, 6, 16, and 17 of IC8; also,
check the motor drive signals
at pins 1, 8, 11, and 18 of
IC8. The chassis frame may
be used as the ground.
Pin 5 of IC8
Pin 1, of IC8
Replace the main
board.