Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 71 / 987

M02
SL01
Primary Transfer
Disengagement
Solenoid
Primary Transfer Roller
Bk Drum_ITB Motor
CAUTION:
When a jam has occurred, the ITB must not be pulled out as it is because the Primary Transfer Rollers are not disengaged
by opening the door. Be sure to execute ITB full disengagement mode (see the related service mode shown below) before
pulling out the ITB.
Related service mode
• Executing ITB full disengagement mode
COPIER > FUNCTION > MISC-P > T1-UP
• Enabling/disabling display of initialization after replacement of the ITB in the Settings/Registration menu
COPIER > OPTION > DSPLY-SW > ITB-DSP
■ ATVC Control
● Primary Transfer ATVC
The transfer voltage required to obtain the target transfer current value is set in order to prevent transfer failure due to
environmental changes.
Control timing
• At power-on (when the fixing temperature is 80 deg C or less)
• At power-on (when the Right Door is opened/closed at times other than at jam removal)
• When the internal temperature has changed by more than the specified value since the last ATVC control
• At paper interval (equivalent to 80 images) during continuous printing
• At last rotation after accumulated 50 images
Control description
1. Monitor current value of the primary transfer DC bias is detected.
2. Optimal target current value is determined based on temperature/humidity data of the Environment Sensor.
3. The primary transfer DC bias to be applied to the Primary Transfer Roller is determined.
● Secondary Transfer ATVC
To set the transfer voltage required to obtain the target transfer current value in order to prevent transfer failure due to
environmental changes and paper type.
Control timing
• At the same timing as the paper interval (equivalent to 80 images) during continuous printing of the Primary Transfer ATVC
• At initial rotation
• At paper interval on a specified print basis (100 sheets)
2. Technology
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