Table 5-6. Repair of the C172 MAIN Board (Continued)
Symptom
Condition
Cause
Checkpoint
Solution
The carriage
unit does not
operate
normally.
The carriage
unit does not
operate at all.
IC15 is defective.
Check the pin 1, 8, 11 or 18
of IC15.
Replace
IC15 or
MAIN
board..
Self-test printing
is abnormal.
Self-test
printing
is not
executed.
IC2 is defective.
Check the output signal at pin 17 of
CN7 (black) or pin 9 of CN8 (color).
Replace
IC2 or
MAIN
board.
Printhead is
defective.
Replace
printhead.
Paper feed
does not
operate
normally.
PF motor
does not
rotate.
Check the signals from pin 1, 2 or
pin 23, 24 of IC16.
Replace
IC2 or
MAIN
board.
IC2 is defective.
IC15 is defective.
Check the signals from pins 3, 6, or
pins 18, 21 of IC16.
Replace
IC16 or
MAIN
borad.
Troubleshooting
EPSON Stylus 1500 Service Manual 5-13
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