Specifications

Table 5-6. Repair of the Main Board (Cont.)
Symptom
The carriage
does not op-
erate
normally.
Conditon
The carriage
does not op-
erate at all.
Cause
IC 10 is
defective.
ICI 7 is
defective.
Checkpoint
Check the oscillator waveform at pins 27, 25,
32 and 31 of
ICIO.
At
IC 17, compare the waveform at pin 2 with
that at pin 4.
Solution
Replace
Ic 10.
Replace
Ic17.
5-15