Drum Motor Control Circuit - Toshiba e-STUDIO555 Service Manual

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).
LGC board
DRCLK-0
DRMCW-0
IC58
DRMVR-0
Main CPU
DRMEN-1
Drum motor drive signal
DRCLK-0 DRMEN-1
Pulse signal L
L
L
L
- H
e-STUDIO555/655/755/855
DRUM/CLEANER UNIT
IC125
Buffer
+5VSW
IC13
Buffer
Q60
SG
Fig. 10-5
Signal
DRMVR-0 DRMCW-0
L
L
H
H
-
10 - 6
MOT board
IC2
Motor driver
L Forward rotation when accelerating/
decelerating
H Reverse rotation when accelerating/
decelerating
L Forward rotation at a constant speed
H Reverse rotation at a constant speed
- Stop
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DRMA-0
DRMB-0
Drum motor
DRMAB-0
DRMBB-0
Motor status