Canon imageRUNNER ADVANCE C2030 Service Manual page 116

2
Process/Operation > Fixing System > Controls > Fixing Arch Control
■ Fixing Arch Control
This machine executes fixing loop control to prevent image and feeding failures.
Fixing loop control is executed to prevent image and feeding failures by keeping the slack of
paper between the Secondary Transfer Outer Roller and Pressure Roller to a specified level.
Since the feeding speed of the Pressure Roller and that of the Secondary Transfer Outer
Roller are not completely the same when a sheet is fed to the Fixing Assembly, the following
problems occur.
When the feeding speed of the Pressure Roller is slower than that of the Secondary Transfer
Outer Roller, the slack of paper becomes larger, causing an image failure or paper wrinkle.
When the feeding speed of the Pressure Roller is faster than that of the Secondary Transfer
Outer Roller, the slack of paper becomes smaller, causing incorrect transfer of a toner image,
and an image expansion occurs.
The following figure shows the slack of paper.
Fixing Film Pressure Roller
ITB
Secondary transfer outer roller
To prevent this symptom, two Arch Sensors located at the inlet of the Fixing Assembly detect
the slack of paper, and the DC Controller controls the rotation speed of the Fixing Motor. This
keeps an appropriate level of paper slack.
2 Process/Operation > Fixing System > Controls > Fixing Arch Control
Sensor Flag
Loop Sensor
(PS22, PS23)
F-2-114
DC Controller
M17
Fixing Motor
Loop Sensor 1
Pressure Roller
(PS22)
Loop Sensor 2
(PS23)
Two Arch Sensors are explained below.
Arch Sensor 1 (PS22): Detects slack of paper when heavy paper is fed.
Arch Sensor 2 (PS23): Detects slack of paper when plain paper other than heavy paper is
fed.
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Loop Sensor 2 Flag
for papers other than
heavy paper
Loop Sensor 1 Flag
for heavy paper
F-2-115
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