Canon imagerunner advance 4551i, Service Manual

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Starting conditions
This control is performed at every paper feeding.
Operation
The fixing motor drive speed is controlled as follows by detecting the paper loop between transfer roller and fixing roller with the
loop sensor.
1. The fixing motor drive speed is reduced by 4.5% when the reading edge of paper is fed 35mm from the transfer roller. The
reduced speed is kept until the loop sensor is turned on by the formed paper loop.
2. After detecting the ON condition of the loop sensor for 50 msec continuously, the fixing motor drive speed is increased by
1.4% compared with the process speed. The increased speed is kept until the loop sensor is turned off by the deleted paper
loop.
3. After detecting the OFF condition of the loop sensor for 50 msec continuously, the fixing motor drive speed is reduced by
4.5% compared with the process speed. The reduced speed is kept until the loop sensor is turned on by the formed paper
loop.
4. Repeat steps 2) and 3). The fixing motor drive speed is increased by 0.9% compared with the process speed when the trailing
edge of paper reaches 65 mm before coming out of the registration roller.
5. When continuously making prints, return to step 1). When making a single print, shift to the last rotation.
Related Service Mode
• Registration loop amnt adj: cst pickup
COPIER > ADJUST > FEED-ADJ > LOOP-CST
• Registration loop amnt adj: MP pickup
COPIER > ADJUST > FEED-ADJ > LOOP-MF
• Registration loop amnt adj: 2-sided feeding
COPIER > ADJUST > FEED-ADJ > LOOPREFE
• Registration loop amnt adj: MP Tr fd of plain 3
COPIER > ADJUST > FEED-ADJ > LOOP-THK
• Registration loop amunt adj: MP Tr fd of spcl ppr
COPIER > ADJUST > FEED-ADJ > LOOP-SP
• Registration loop amnt adj: cst feed of envlp
COPIER > ADJUST > FEED-ADJ > LOOP-ENV
Fixing pressure/pressure release control
Purpose
Release/application of pressure for fixing is performed automatically by rotating the Fixing Motor clockwise or counterclockwise
direction.
When the paper jam occurs, the jammed paper can be removed easily by the pressure release control of the fixing unit.
Control Timing
Pressure release timing
• When a jam is detected
* Power-on jam is included in the jam detection mentioned above.
* However, door open jam is excluded.
Pressure application timing
• At power-on with pressure-released state.
• after jam removal.
Control Sequence
Fixing pressure release
1. When the Fixing Pressure Release Sensor is OFF, the Fixing Motor rotates to the reverse direction.
2. When the Fixing Pressure Release Sensor detects ON for more than specified time continually, the Fixing Motor stops.
Fixing pressure
1. When the Fixing Pressure Release Sensor is ON, the Fixing Motor rotates to the reverse direction.
2. When the Fixing Pressure Release Sensor detects OFF for more than specified time continually, the Fixing Motor stops.
Related Error Codes
E009-0000: Fixing Motor pressure error
E009-0001: Fixing Motor pressure release error
2. Technology
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