Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 88 / 987

● Black Band Sequence
Execution condition/timing
hen the travel distance of the drum or the ITB has exceeded the designated value
Control description
In order to prevent the Cleaning Blades flip, toner is supplied to the Drum Cleaning Blade and the ITB Cleaning Blade.
● Developing Discharge Sequence
Execution condition/timing
When the average image ratio per sheet reaches the default value or less
Control description
Supply a toner in ITB, then maintain ability for developing.
■ Warm-up Rotation Control
Operation overview
This operation is performed to check the status of sensor/motor at power-on or recovery from sleep mode.
According to the conditions, one of the following 3 patterns of warm-up rotation is performed: none, short, or long.
Status Fixing temperature
Specified value or higher Specified value or lower
Power-on None Long
When recovering from sleep mode of 24
hours or more - Long
When recovering from sleep mode of at least
4 hours and less than 24 hours - Short
When recovering from sleep mode of less
than 4 hours None None
Warm-up rotation con-
trol
Long Short None Reference
Primary Transfer Roller
disengagement control Executed Executed Not executed “Primary Transfer Roller Engagement/
Disengagement Control” on page 59
Stirring of waste toner Executed Executed Not executed -
Idle rotation of the Devel-
oping Assembly Executed Executed Not executed -
Drum Unit detection Executed Executed Not executed “Drum Unit detection” on page 56
Drum Unit life detection Executed Executed Not executed “Drum Unit Life Detection” on page 57
Primary transfer ATVC Executed Executed Not executed “Primary Transfer ATVC” on page 60
Color displacement cor-
rection control Executed Not executed Not executed “Color Displacement Correction Con-
trol” on page 66
2. Technology
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