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Symptom
The carriage
operates
abnormally.
Table 56. C204 MAINIDRVIDRV-B boards Component Repair W
Cause
Checkpoint
Solution
The carriage encoder Observe the carriage encoder sensor
sensor is defective.
output signal at pins 4 (ENCA) and 3
Replace the
(ENCB) of CN4 on the C204 MAfN
carnage encoder
sensor.
board
Carriage operation is
unstable (due to a
Check the switching waveform for Q5,
Q6, and 07.
Replace the
lack of motor torque).
abnormal transistor.
Rev. A
5-19