Reverse Motor Control Circuit - Toshiba e-STUDIO520 Service Manual

15.6 Reverse motor control circuit

The reverse motor is a stepping motor driven by the control signal output from the PFC CPU on the
LGC board and rotates the reverse motor-1 and -2.
The reverse motor is driven by the pulse signal (MTMA-0, MTMB-0, MTMAB-0, MTMBB-0) output from
the driver IC. These pulse signals are formed based on the reference clock signal (REVMC-0) and out-
put only when the enable signal (REVME-0) is L level. Also, the rotation speed or direction of the motor
can be switched by changing the output timing of each pulse signal. The rotation direction can be
switched by the motor rotation direction switch signal (REVCW-0).
LGC board
REVMC-0
REVCW-0
IC57
RVMVR-0
PFC CPU
REVME-0
Reverse motor drive signal
REVMC-0 REVME-0
Pulse signal
-
e-STUDIO520/600/720/850 EXIT/REVERSE SECTION
IC103
Buffer
+5VSW
Q63
SG
Signal
RVMVR-0
L L
L L
L H
L H
H -
MOT2-RV board
IC1
Motor driver
Fig.15-7
REVCW-0
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
15 - 10
MTMA-0
MTMB-0
Reverse motor
MTMAB-0
MTMBB-0
Motor status
March 2005 © TOSHIBA TEC