Bd Detection Correction Control; Dustproof Shutter - Canon imageRUNNER ADVANCE C255 Series Service Manual

Related error code
E001-000x: Scanner Motor error
• E100-0001: BD error
• E110-0001: Scanner Motor error (FG lock)
• E110-0002: Scanner Motor error (BD speed lock)
• E110-0003: Scanner Motor error (BD phase lock)
• E110-0005: Scanner Motor error (GBD signal not detected))

BD Detection Correction Control

Purpose
Corrects the displacement of each color's laser write start position due to Polygon Mirror accuracy and Polygon Motor rotation
accuracy.
Execution timing
At power-on, and at printing
Control description
1. The DC Controller PCB measures the BD interval after the completion of constant speed rotation control of the Scanner
Motor.
2. The DC Controller PCB calculates the correction value from the displacement of the BD interval.
3. The write start position is corrected by adjusting the write start timing based on the above correction value.

Dustproof Shutter

Purpose
Prevents dropped toner getting attached on the Dustproof Glass when installing/removing the cartridge.
Execution timing
At image formation and when the Waste Toner Container is removed and then installed
Control description
The Waste Toner Container is interlocked with the Shutter Lever of the Laser Scanner Assembly to open/close the Dustproof
Shutter.
When the Waste Toner Container is inserted, the Dustproof Shutter opens. When the Waste Toner Container is pulled out, the
Dustproof Shutter closes.
Dustproof Shutter
Shutter Lever
50
Waste Toner Container
2. Technology