Canon imageRUNNER ADVANCE C255 Series Service Manual page 74

4. When the displacement is eliminated and the friction between the belt and the sliding member is eliminated, the steering
shaft goes back into the equilibrium state again.
■ ITB Cleaning Control
Remove residual toner on the ITB.
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.
Related service mode
• Setting of the interval (number of sheets) to conduct ITB cleaning
COPIER > OPTION > CLEANING > ITBB-TMG
• Setting of the number of transparency to execute ITB cleaning
COPIER > OPTION > CLEANING > OHP-PTH
■ Secondary Transfer Outer Roller Cleaning Control
Soiling at the back of the sheet caused by soiling of the Secondary Transfer Outer Roller can be prevented.
Control timing
• When image stabilization control (generation of patch image on the ITB) is executed during warm-up rotation
• At last rotation
• After executing the image stabilization control (generation of patch image on the ITB)
Control description
1. The secondary transfer cleaning bias (DC minus + DC plus), which has been generated on the Secondary Transfer High-
voltage PCB (UN02), is applied to the Secondary Transfer Outer Roller.
2. Residual toner on the Secondary Transfer Outer Roller is attached to the ITB, and then collected by the ITB Cleaning Unit.
Bk Drum
M02
_ ITB Motor
Waste Toner
Feed Screw
ITB Cleaning Blade
63
2. Technology