Release Motor (M2) Control - Canon DADF-AA1 Service Manual

<Release operation sequence>
Original replacement
Document set sensor
(SR5)
Pickup/feed motor
(M1)
Pickup clutch
(CL1)
Registration clutch
(CL2)
Timing sensor
(SR4)
Registration sensor
(SR1)
Read sensor
(SR2)
Delivery reversal sensor
(SR3)
Image leading edge signal
Release motor
(M2)
Release motor HP sensor
(SR11)

3.6.4 Release motor (M2) Control

The Release motor (M2) control circuit diagram is shown below. The Release motor (M2) is a 2-phase stepping motor. This circuit mainly performs the following
types of control:
- Motor ON/OFF control
- Motor rotation direction control
- Motor speed control
The Release motor of the ADF is controlled by the main controller PCB. The main controller PCB outputs drive pulses to the Release motor according to the doc-
ument feed timing.
The Release motor is a stepping motor. Its rotation direction and speed are controlled by changing the order of drive pulses (A, /A, B, /B) and frequency.
Start key ON
Document pickup signal input
Document
separation/feed
Read stanby
loop formation
F-3-27
J12
3
B
4
/B
Motor
driver
2
/A
A
1
ADF driver PCB
F-3-28
Document
Document reading
delivery
M2
Chapter 3
0024-7002
3-17