Brother International MP-21C Service Manual - Page 36
Paper Feed and Carriage Motor Drive Circuit
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2.3.3 Paper Feed and Carriage Motor Drive Circuit A PM-type stepper motor is used to feed paper and is driven at a constant voltage. A DC motor is used for the carriage. It uses the feedback signal (EINT-P) from the linear encoder and its speed is controlled via the gate array by the CPU using the PWM control method. The paper feed driving circuit is turned on and off by the M5VCNT signal from the CPU. #4 CPU 12V M5VCNT #1 #7 LF Driver M54676 STPM0 STPM1 G/A STPM0N STPM1N STPPWM0 STPPWM1 P1 To LF Motor Fig. 2.6 #4 #7 EINT-P ENC 2-P ENC 1-P P6 To Encoder sensor on the carriage PCB CPU DCM0 G/A DCM1 DCM0N DCM1N Fig. 2.7 #2 P4 To CR Motor #3 CR Drive motor II-6
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II-6
2.3.3
Paper Feed and Carriage Motor Drive Circuit
A PM-type stepper motor is used to feed paper and is driven at a constant voltage. A DC
motor is used for the carriage. It uses the feedback signal (EINT-P) from the linear
encoder and its speed is controlled via the gate array by the CPU using the PWM control
method. The paper feed driving circuit is turned on and off by the M5VCNT signal from
the CPU.
#4
CPU
STPM0
STPM1
STPM0N
STPM1N
STPPWM0
STPPWM1
M5VCNT
12V
P1
#1
LF Driver
M54676
To LF Motor
G/A
#7
Fig. 2.6
#4
#7
#2
#3
P6
P4
CPU
EINT-P
ENC 2-P
ENC 1-P
DCM0
DCM1
DCM0N
DCM1N
To
Encoder sensor on
the carriage PCB
To CR Motor
CR Drive motor
G/A
Fig. 2.7