Canon DADF-P1, Service Manual

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Chapter 2
2-10
2.6.2 Operation Sequence
0010-3917
F-2-21
2.6.3 Feed Motor (M1) Control
0010-3918
The feed motor (M1) control circuit diagram is shown below. The feed motor (M1) 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
F-2-22
The feed motor of the ADF is controlled by the ASIC (IC1) on the reader controller PCB. The ASIC (IC1) on the reader controller PCB outputs drive pulses to the
feed motor according to the selected print mode (magnification, operation mode, timing, etc.).
The feed motor is a stepping motor. Its rotation direction and speed are controlled by changing the order of output pulses (RMOT_A, RMOT_A*, RMOT_B, and
RMOT_B*) and frequency.
2.7 Detecting Jams
2.7.1 Jam
0010-3919
This machine detects a jam using the sensors shown below. Document jam check timings are stored in the ROM on the image processor PCB to check whether a
jam has occurred according to presence/absence of the document at the relevant sensor position.
When a jam occurs, the host machine stores its code.
Jam codes can be checked by outputting a jam error log report in the service mode of the host machine.
F-2-23
Document delivery
Document
separation/feed
Document reading
Document set
sensor (PI11)
Registration paper
sensor (PI8)
Read sensor (PI7)
Delivery reversal
sensor (PI6)
Pickup motor (M2)
Feed motor (M1)
Roller release
solenoid (SL1)
Image leading
edge signal
Start key ON
or
document pickup
signal input
Document
placement
: Reverse rotation of motor
Reverse rotation
Forward rotation
Loop formation
Read standby
IC2
Motor
driver
+24V
RMOT_A
RMOT_A*
RMOT_B
RMOT_B*
M1
CN4
4
6
5
3
1
2
RMOT_B
RMOT_B*
RMOT_ A
RMOT_ A*
ADF driver PCB
RMOT_IA
RMOT_IB
Reader
controller
PCB
CN1
J412
IC1
ASIC
PI10
PI7
PI6
PI8
PI11