Operation Sequence; Feed Motor (M1) Control; Detecting Jams; Jam - Canon DADF-P1 Service Manual

Chapter 2

2.6.2 Operation Sequence

Read sensor (PI7)

2.6.3 Feed Motor (M1) Control

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
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

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.
2-10
Start key ON
or
document pickup
signal input
Document
placement
Document
separation/feed
Document set
sensor (PI11)
Registration paper
sensor (PI8)
Delivery reversal
sensor (PI6)
Loop formation
Pickup motor (M2)
Reverse rotation
Feed motor (M1)
Roller release
solenoid (SL1)
Image leading
edge signal
: Reverse rotation of motor
RMOT_A
RMOT_A*
IC1
ASIC
RMOT_B
RMOT_B*
RMOT_IA
RMOT_IB
Reader
controller
PCB
PI7
PI6
PI8
Document reading
Read standby
Forward rotation
F-2-21
+24V
CN4
RMOT_A
4
IC2
5
Motor
RMOT_A*
driver 6
RMOT_B
3
2
RMOT_B*
1
ADF driver PCB
F-2-22
PI10
PI11
F-2-23
Document delivery
M1
0010-3917
0010-3918
0010-3919