Canon DADF-N1 Service Manual page 55

PMOT_A
PMOT_A*
IC1
PMOT_B
CPU
PMOT_B*
PMOT_V-REF
ADF controller PCB
F-2-26
The CPU (IC1) of the ADF controller PCB receives commands from the host machine for
print mode (e.g., magnification, operation, timing). In response, it sends drive pulses to the
pickup motor.
The pickup motor is a stepping motor, and changes the order and frequency of its drive
pulses (OUTA, OUTA*, OUTB, OUTB*) to change the direction and speed of motor
rotation.
Signal
PMOT_A
PMOT_A*
PMOT_B
PMOT_B*
PMOT_V-REF
OUTA
IC8
Motor
OUTA*
driver
OUTB
OUTB*
T-2-10
Drive pulse A
Drive pulse A (reverse phase)
Drive pulse B
Drive pulse B (reverse phase)
Reference current level setting
+24V
J8
3
1
4
5
2
6
Description
Chapter 2
M2
2-33