Service manual

Chapter 5 Troubleshooting
Rev. A
5-
3
Symptom Condition Cause Checkpoint Solution
Paper does
not advance
normally.
Drive signals
are not
output
correctly.
CPU (IC2) is
defective
Is the signal waveform correcr at pin 7/8
of IC2?
Replace IC2
PF Motor
driver (IC16)
is defective
Is the signal waveform correct at pin
14/17/20/23 of IC16?
Correct:
Replace PF
Motor
Incorrect:
Replace IC16