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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.
Figure 5-9.
Developing motor control circuit
The DC controller judges the developing motor faulty under the following conditions and
sends an error message to the formatter:
● Developing motor start abnormality: The interval of the /DRMITBFG signals does not
become regular in 1000 ms from the start of the developing motor.
● Developing motor rotation abnormality: The interval of the /YMCDEVFG signal stays
irregular for 100 ms or more after it has become regular.
Fan control
The fan control controls the drive of the fan.
The fan, a DC brushless motor with a built-in Hall effect device, exhausts air to prevent the
temperature from rising around the fuser unit. The fan operates under the control of the FAN
DRIVE signal (/FAND) the DC controller.
Figure 5-10.
Fan control circuit
ENWW Engine control system 125