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5. Check the tractor motor encoder (TME). Place the rotary switch in the "0"
position on the MPU board, and perform the following steps.
A Phase:
a. Put the positive lead of the digital multimeter on TP4 on the I/O board, and
b. Power ON the printer.
c. While rotating the tractor motor axis, measure the voltage, which should
B Phase:
a. Put the positive lead of the digital multimeter on TP3 on the I/O board, and
b. Power ON the printer.
c. While rotating the motor axis, measure the voltage, which should fluctuate
If the TME is not normal, replace the tractor motor.
6. Check the control circuit adjustment. Determine if an error occurs when the
tractor motor begins rotation during power–on. If an error occurs, adjust the
tractor motor control circuit VR.
NOTE: An engine checker is required; refer to Chapter 8, "Engine Checker," for
There are three adjustments (detent, forward, and reverse), as follows:
Tractor motor adjustment (detent):
a. Put the positive lead of the digital multimeter on CP28 on the I/O board, and
b. Set the tractor in a detent state.
c. Adjust VR12 so the digital multimeter reads 0V
d. Put the positive lead of the digital multimeter on CP10 on the I/O board, and
7–54
the negative lead on the SG.
fluctuate between 0V and 5V.
the negative lead on the SG.
between 0V and 5V.
the engine checker menu structure.
the negative lead on CP1 on the I/O board.
the negative lead on CP1 on the I/O board.
20mV.
Troubleshooting
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