Table of Contents
Advertisement
Table 5-4. Repair of a Problem in the BOARD ASSY., MAIN (Cont.)
Symptom
The CPU does
The printer
does not op-
not operate.
erate at all.
The carriage
The carriage
does not op-
operates
abnormally.
erate at all.
Carriage oper-
ation is unsta-
ble (lack of
torque).
Cause
Either ROM or
RAM is
defective.
Check the oscillator signal at either pin 33
The CPU is
or pin 34 of the CPU.
defective.
Check the MOTOR, CR phase signal at pins
defective.
9, 10, 11, and 12 of ICIC.
At IC2A, check the input signal for pin 90
defective.
and the output waveform for pin 100.
s
defective.
5-15
REV.-B
I
If a signal is
detected, re-
place IC 1 C.
Otherwise, re-
place CR 1.
Replace IC 1 C.
Replace IC2A.
Replace IC2A.
Advertisement
Chapters
Table of Contents
