Toner Supply Assembly - Canon imageRUNNER ADVANCE C255 Series Service Manual

• When it is determined necessary based on the predicted value for temperature inside the machine (according to the usage
environment and continuous print state).
Control description
Color displacement correction control based on patch pattern
1. The Main Controller PCB forms the patch pattern of each color on the ITB.
2. The DC Controller PCB scans this patch pattern using the Registration Patch Sensor Unit (Front) (UN31) and
Registration Patch Sensor Unit (Rear) (UN32) to detect the amount of color displacement compared to the reference
color (Y).
3. Based on the above-mentioned detection result, the DC Controller PCB executes correction according to the degree of
color displacement.
Color displacement correction control based on temperature prediction
1. The degree of color displacement is measured based on the operating condition (mainly temperature).
2. The exposure timing for M/C/Bk is adjusted based on Y.
3. Color displacement correction is performed based on the above patch patterns.
Correction in horizon-
tal scanning direction
Correction in vertical
scanning direction

Toner Supply Assembly

■ Overview
Toner is supplied from the Toner Container to the Developing Assembly. The toner level in the Toner Container is detected at
the same time.
Toner Log Connector
(UN38,39,40,41)
Hopper Unit
Toner Feed Screw
Parts name
Hopper Unit
Toner Feed Screw
Type of control
Write start correction
Entire-area magnification ratio
correction
Write start correction
Image skew correction
Bottle Rotation Sensor
(Y,M,C,Bk)
Developer Feed Screw B
Developer Feed Screw A
Correction description
Write-start timing in horizontal scanning direction is changed.
Pixels in horizontal scanning direction is increased/reduced (at the
both edges of the image)
Write-start timing in vertical scanning direction is changed.
Image data is corrected.
(Y,M,C,Bk)
(PS6,7,8,9)
Toner Container
ATR Sensor
(Y,M,C,Bk)
(UN34,35,36,37)
Toner is supplied from the Toner Container to the Developing As-
sembly.
Toner is supplied from the Hopper Unit to the Developing Assembly.
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2. Technology
Role