Itb Cleaning - Canon imageRUNNER ADVANCE C350 series Service Manual

2
Technical Explanation > Image Formation System > Controls > Transfer/Separation
● Secondary Transfer Bias Control
Toner on the ITB is transferred to a paper.
The secondary transfer bias, which has been generated on the Secondary Transfer High-
voltage PCB (UN02), is applied to the Secondary Transfer Outer Roller.
There are 2 types of the secondary transfer bias (the DC positive and the DC negative) to
apply bias with the following purpose.
• DC positive: Toner on the ITB is transferred to a paper when printing.
• DC negative: Toner on the Secondary Transfer Outer Roller is attracted onto the ITB when
cleaning.
The secondary transfer bias value is determined by the ATVC control with the DC Controller,
which makes constant current value running though the Secondary Transfer Outer Roller.
Secondary Transfer Outer Roller
ITB
2 Technical Explanation > Image Formation System > Controls > Transfer/Separation
DC+ DC-
Secondary Transfer
High-voltage PCB (UN02)
DC Controller PCB (UN04)
F-2-86
● ITB Cleaning
Residual toner on the ITB is removed.
Control description
1) The ITB Cleaning Blade scrapes toner on the ITB.
2) The scraped toner is fed to the Waste Toner Container with the Waste Toner Feed
Screw.
M02
Waste Toner
Feed Screw
Related service mode:
• Setting of the interval (number of sheets) to conduct ITB cleaning
• Setting of the number of transparencies to execute ITB cleaning
Bk Drum
_ ITB Motor
ITB Cleaning Blade
F-2-87
2-66
2-66