Canon Finisher-AB1, Service Manual

Page: 48 / 463

Chapter 3
3-14
3.4.4 Horizontal Registration Correction/Alignment Operation
0015-2079
1) About 200 msec after the inlet sensor (PS3) detects the lead edge of paper, the finisher controller PCB causes
the transport motor (M2) to rotate clockwise, thereby causing the roller inside the shift roller unit to rotate.
2) The finisher controller PCB computes the horizontal registration correction value with reference to the result
of horizontal registration detection. Thereafter, when the lead edge of paper reaches the buffer path 1 sensor
(UN13), the PCB causes the horizontal registration shift motor (M7) to rotate clockwise or counterclockwise in
keeping with the horizontal registration correction value so that the shift roller unit moves to the front or the
rear, causing the paper clamped by the shift roller to move to the front or to the rear. All this serve to correct the
horizontal registration of the paper to an appropriate value.
F-3-13
[1]Shift roller unit
[2]Horizontal registration detection unit
[3]Paper
PS3
PS3
Finisher controller PCB
UN13
M2
M7
UN13
M2
M7
[1]
[3]
[2]