Canon DU-82, Руководство по обслуживанию

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3. Side Registration Adjustment
This printer adjusts the side registration so that the center of the second page in the horizontal
direction matches the center of the printable area on the drum during duplex printing. This
adjustment is done by pushing the side registration guide to both sides of the print paper.
The side registration guide home position sensor (PS25) detects whether the side registration
guide is at its home position.
When the power turns ON, the duplexing driver drives the side registration motor(M7) to
return the side registration guide to its home position. If the side registration guide is already
at its home position, it is moved from the home position, then returned to it.
When the reversing roller rotates clockwise(CW) and the print paper is fed to the duplexing
unit, the duplexing driver checks the home position of the duplex feed roller 1. If the duplex
feed roller 1 is not at its home position, the duplexing driver turns ON the duplex feed clutch
(CL5) and rotates the duplex feed roller 1. When the home position of duplex feed roller 1 is
detected, the duplexing driver turns OFF CL5 and stops duplex feed roller 1. Then, the duplex-
ing driver turns ON CL5 in a specified period of time after the reversing roller begins rotating
CW, and the duplex feed roller 1 rotates. When the home position of the duplex feed roller 1 is
detected, the duplexing driver turns OFF CL5 and stops the duplex feed roller 1. The print paper
stops without touching the duplex feed roller 1. When the print paper size is not A4(landscape),
Letter(landscape), or A5, the duplexing driver turns ON the reversing roller release solenoid
(SL7), releases the reversing roller pressure, sets the print paper completely free, and completes
preparation for side registration adjustment.
Figure 2-2-4
When the preparation ends, the duplexing driver runs the side registration motor (M7) for the
prescribed number of pulses according to the paper size data from the DC controller and moves
the side registration guide according to the paper size. Thus, the side registration of the paper
is adjusted (Note).
When the paper is fed and its leading edge is detected by the duplex unit paper sensor (PS24),
the side registration guide returns to its home position after the prescribed time. M7 is a step-
ping motor that can control the moving distance accurately.
If the distance the side registration guide makes after the start of its home position detection
exceeds the maximum distance value stored in the duplexing driver, the side registration guide
failure is assessed and reported to the video controller via the DC controller.
The duplexing driver assesses a duplex feed unit failure and reports it to the video controller
via the DC controller, if the duplexing unit paper sensor cannot detect paper when the duplex
feed roller 1 makes 2 rotations after the side registration.
Note: If the print paper size is not A3, Ledger, A4 (landscape), Letter (landscape), or B4, the
moving distance of the side registration guide increases. The duplexing driver runs M7
while the reversing roller is turning counterclockwise (CCW), and moves the side regis-
tration guide to the appropriate position for the paper size.
2 - 8
CHAPTER 2
Reversing roller (CCW rotation)
Duplex lower guide
Reversing roller
pressure
release plate
Duplex upper guide
Reversing
unit
Duplexing unit
Duplex feed roller 1
(Home position)
Duplex pick-up
sensor lever
Duplex feed
roller 2
Duplexing unit paper sensor