Canon CLBP-460PS, Service Manual

Page: 162 / 566

3. Side registration adjustment
The duplexing unit conducts side registration adjustment so that the center of the paper in the
horizontal direction matches the center of the printable area on the intermediate transfer belt
when the second side is printed. To adjust the side registration, the side registration guides are
pressed against both sides of the paper.
The home position of the side registration guide is detected by the side registration home posi-
tion sensor (PS3105).
During the duplexing unit wait period, the duplex driver PCB rotates the side registration
motor (M3103) clockwise and moves the side registration guide to the home position. When the
PS3105 detects the home position, the duplex driver PCB stops the M3013 and holds the side
registration guide at the home position.
Figure 2-7-5
During duplex printing, the duplex driver PCB drives the duplex feed motor (M3101) and rotates
the duplex feed roller when the reversing unit stationary paper sensor (PS3103) detects paper.
When the paper fed to the duplex feed unit by the duplex feed roller is detected by the duplex-
ing unit pick-up paper sensor (PS3103), the duplex driver PCB stops driving the M3101 and
feeding the paper. At the same time, feed roller pressure release solenoid (SL3101) is turned ON,
and the pressure to the feed roller pressure sub roller is released to set the paper free. (See fig-
ure 2-7-6)
Then, the duplex driver PCB drives the M3103 for the specified number of pulses according
to the paper size data sent from the DC controller and moves the side registration guide accord-
ing to the paper size. As a result, side registration of the paper is adjusted.
2 - 104
CHAPTER 2
M3103
Reversing unit
Duplex feed unit
To printer
Side registration motor
Side registration guide
Side registration home position sensor
(PS3105)
Duplex pick-up paper sensor
(PS3104)
Duplex feed roller
Duplex feed roller
Print paper
<Operation of the side registration>