Controlling The Pickup Motor (M1) - Canon DADF-M1 Service Manual

2.4.4 Controlling the Pickup Motor (M1)

The following is a diagram of the circuit used to control the pickup motor (M1). The pickup
motor is a 4-phase stepping motor, and the circuit serves the following functions:
- turning on/off the motor
- controlling the rotation direction of the motor
- controlling the rotation speed of the motor
MOT-B*
MOT-B
MOT-A*
IC9
CPU
MOT-A
MOT-CUT
MOT-REF1
MOT-REF2
ADF driver PCB
IC9 on the ADF driver PCB receives print data (command) on printing mode from the host
machine (magnification, operation mode, timing); in response, it generates drive pulses to
drive the pickup motor.
The pickup motor (M1) is a stepping motor, and its direction and speed of rotation are
varied by changing the order and the frequency of drive pulses (A, A*, B, B*).
+24V
A
IC8
Motor
A*
Driver
B
+5V
B*
REF
F-2-29
Chapter 2
0002-9497
J11
3
1
4
5
2
6
M1
2-37