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TROUBLESHOOTING
Rev. B
5-1
9
Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 4/7
Symptom Cause Checkpoint Solution
The carriage
operates
abnormally.
The carriage encoder
sensor is defective.
Observe the carriage encoder sensor
output signal at pins 4 (ENCA) and 3
(ENCB) of CN4 on the C204 MAIN
board.
Replace the
carriage encoder
sensor.
Carriage operation is
unstable (due to a
lack of motor torque).
Check the switching waveform for Q5,
Q6, and Q7.
Replace the
abnormal transistor.