ENWW Engine control system 115
Drum motor control
The drum motor control controls the drive of the drum motor (M3).
The drum motor is a three-phase, eight-pole DC motor with a built-in drive circuit. The drum motor
drives the four color photosensitive drums, the K (black) developing cylinder, and the ITB. The
drum motor operates under the control of the DRUM MOTOR ACCELERATION signal (/
DRMITBACC) and the DRUM MOTOR DECELERATION signal (/DRMITBDEC) from the DC
controller.
Figure 5-7 Drum motor control circuit
The DC controller monitors the DRUM MOTOR SPEED DETECTION signal (/DRMITBFG) to
control the RPM of the drum motor.
Under the following conditions, the DC controller judges the drum motor faulty and sends an error
message to the formatter:
● Drum motor start abnormality: The interval of the /DRMITBFG signals does not become
regular in 1000 ms from the drum motor start.
● Drum motor rotation abnormality: The interval of the /DRMITBFG signal stays irregular for 100
ms or more after it has become regular.
Developing motor control
This developing motor control controls the drive of the developing motor (M4).
The developing motor, a three-phase eight-pole DC motor with a built-in drive circuit, drives the Y,
M, and C cartridges. The developing motor is controlled by the DC controller, which sends the
DEVELOPING MOTOR ACCELERATION signal (/YMCDEVACC) and the DEVELOPING MOTOR
DECELERATION signal (/YMCDEVDEC) to drive the motor.
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