Canon DADF-Q1, Service Manual

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Chapter 2
2-20
F-2-31
[1] ADF controller PCB
[2] Current detection circuit
M4: separation motor
MI2: separation motor clock sensor
When the CPU sends the motor rotation speed signal (SPPWM), the separation motor (M4) starts to rotate in a specific direction. The separation motor clock sensor
(PI2) sends the separation motor rotation speed signal (SPCLK) to IC17 (speed control IC). In response, IC17 compares the arriving rotation speed signal against
the speed reference signal (SEPCLKREF) from the CPU, and sends the result as the speed control signal (SPMFV) to the CPU. Using the arriving speed control
signal, the CPU varies the rotation speed signal. LED3 goes on when the motor rotation speed is within a specific range, while going off if out of the range. The
current detection circuit monitors the current flowing in the separation motor; when the level of the current exceeds a specific value, it sends the separation motor
stop signal (SPLIM) to stop the motor. The CPU identifies a fault in the separation motor if the separation motor stop signal continues, indicating an error code
(E405) on the host machine's display.
Error code: E405
- fault in the separation motor (M4)
- fault in the separation clock sensor (PI2)
- fault in the ADF controller PCB
2.4.7 Sequence of Operations
0011-2347
Picking Up/ Separation Originals
F-2-32
2.5 Document Feeding/Delivery
2.5.1 Outline
0011-2385
Originals are moved by rotating the feeding belt by the belt motor (M2). Further, originals are moved either to the right or to the left depending on the operating
mode in question.
Originals are delivered by rotating the delivery motor (M5). Originals are always delivered to the original delivery tray.
M4
SPLIM
SPPWM
SPCLK
SEPCLKREF
SPMFV
+24R
+5V
J12
J8
PI 2
IC18
CPU
Q28
Q29
LED3
IC16
1
2
5
Start key ON
Original sensor (S6)
Pickup roller home
position sensor (PI 7)
Pickup roller height
sensor 1/2 (PI 8/9)
Pickup motor (M3)
Separation motor (M4)
Separation clutch (CL)
Separation sensor (S4)
Skew sensor (S5)
UP DOWN UP
UP
DOWN
Picking up/
separating
1st original Picking up/
separating
2nd original End Pickup roller shifting
to home position
Feeding/Separation
Pickup
position Wait
position Pickup
position Wait
position
Home position