Canon DADF-Q1, Service Manual

Page: 38 / 156

Chapter 2
2-16
T-2-8
F-2-22
b.Movement
When the Start key on the copier is pressed, the DADF's stopper plate moves down and
the pickup motor (M3) starts so that the pickup roller unit moves down to reach the stack of
originals.
The pickup motor will stop when the pickup roller unit has reached the pickup height sensor
1 (PI8) and the pickup height sensor 2 (PI9) and then has moved down about 1 mm.
F-2-23
When the pickup roller unit stops to move down, the separation clutch (CL) and the separation motor (M3) start to move the 1st original to the separation assembly.
Stop position Operation Related sensor (notation)
Home position Waits until the next copying operation. Pickup roller home position sensor (PI7)
Wait position Waits until the next pickup position Pickup height sensor 1/2 (PI8/9)
Pulse control of pickup motor (M3)
Pickup position Picks up originals Pickup height sensor 1/2 (PI8/9)
Pulse control of pickup motor (M3)
Home position Escape position Pickup position
M3
PI 9
PI 8
PI 8/9
PI 7
PI 7
Pickup roller units
Separation unit
M3 M3
1 mm (approx.)
PI 8/9
Pickup roller unit
Stopper plate