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Speed Precision Abnormality
NOTE: Refer also to Chapter 9, "Board Adjustments."
1. Check the main unit feed motor control circuit.
a. With paper loaded, use the control panel to run printer test patterns (allowing
b. If LD1 blinks or does not light, adjust VR1 on the MPU board until LD1
2. Check the main unit feed motor encoder.
Encoder 20:
a. Put the positive lead of the digital multimeter on pin 2 of CN6 on the MPU
b. While rotating the motor axis by hand, measure the voltage, which should
Encoder 19:
a. Put the positive lead of the digital multimeter on pin 5 of CN6 on the MPU
b. While rotating the motor axis by hand, measure the voltage, which should
If voltage is not normal, replace the abnormal encoder after checking the harness.
3. Determine if the main unit feed motor is overloaded. With paper loaded, perform
the following steps:
a. Place the rotary switch in the "E" position on the MPU board.
b. Put the positive lead of the digital multimeter on R132 (E side of Q1) on the
c. Turn the power ON.
d. Measure the voltage when the paper arrives at the exit point, so that the
7–42
the feed motor to operate in the low speed mode). The LED (LD1) on the
MPU board should emit a steady light.
emits a steady light.
board, and the negative lead on the SG.
fluctuate between 0V and 5V.
board, and the negative lead on the SG.
fluctuate between 0V and 5V.
MPU board, and the negative lead on the PG.
motor is loaded. The voltage should be over 1V during main unit feed motor
operation.
Troubleshooting
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