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DRUM/CLEANER UNIT
10 - 6
10.5 Drum motor control circuit
The drum motor control circuit is composed as shown in the figure below. It drives the drum motor by
the drive signal output from the main CPU on the LGC board, and rotates the drum.
The drum motor is a stepping motor driven by the pulse signal (DRMA-0, DRMB-0, DRMAB-0, DRMBB-
0) output from the motor driver. These pulse signals are formed based on the reference clock signal
(DRCLK-0), and output only when the enable signal (DRMEN-1) is L level. Also, the rotational speed of
the motor is switched by changing the frequency of the reference clock signal (DRCLK-0) while its
rotational direction is switched with the motor rotational direction switch signal (DRMCW-0).
Fig. 10-5
Drum motor drive signal
Signal
Motor status
DRCLK-0 DRMEN-1 DRMVR-0 DRMCW-0
Pulse signal L L L Forward rotation when accelerating/
decelerating
L L H Reverse rotation when accelerating/
decelerating
L H L Forward rotation at a constant speed
L H H Reverse rotation at a constant speed
- H - - Stop
MOT board
IC58
Main CPU
DRMCW-0
DRCLK-0
Drum motor
DRMEN-1
DRMVR-0
DRMB-0
DRMA-0
DRMBB-0
DRMAB-0
IC125
Buffer
IC13
Buffer
Q60
IC2
Motor driver
LGC board
+5VSW
SG