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18 – Drum Motor Fail (complete stop)
1. Ensure that the drum motor operates during power–on.
If the motor is operating properly, go to Step 2. Otherwise, go to "Speed
Precision Abnormality" on page 7–60.
2. Check the fuse.
a. Put the lead rods of the digital multimeter on either side of F3 (fuse 3) on the
b. Measure the resistance, which should be 0Ω (the fuse is not blown).
If the fuse is blown, replace the I/O board.
3. Check the drum motor.
a. Place the rotary switch in the "E" position on the MPU board.
b. Remove the 2–pin connector of the drum motor.
c. Hold the connector with the flat part of the connector facing up and the
d. Turn the power ON.
e. Measure the voltage. If it is not about 24V during main unit feed motor
4. Check the I/O board.
a. Put the positive lead of the digital multimeter on pin 9 of CN29 on the I/O
b. Measure the voltage. If it is not 24V during power–on, replace the I/O board
Troubleshooting
CHECKLIST:
DRUM MOTOR
FUSE (F3)
I/O BOARD
CONTROL CIRCUIT
DRUM MOTOR ENCODER (DME)
I/O board.
notched part facing down. Put the positive lead of the digital multimeter on
the right connector pin (positive), and the negative lead on the left connector
pin (negative).
operation, replace the I/O board.
board, and the negative lead on the PG.
after checking the output of the DC Power Supply board.
7–59
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