Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 81 / 987

Control description
Supply amount of the toner for each color is calculated by the abovementioned startup timing, and toner is supplied to the Drum
Unit. The DC Controller PCB determines toner supply amount by the following 2 data:
• For each print job (every page)
• For each print job (every page)
• ATR Sensor output value (DC Controller PCB)
• Video count value (Main Controller PCB)
The DC Controller PCB turns ON the Bottle Motor (YM) (M09) and Bottle Motor (CK) (M10) when it determines that toner supply
is necessary.
This makes the Toner Feed Screw and the Developer Feed Screw A/B rotate so that the specified amount of toner is supplied
to the Developing Assembly.
M09
M10
Bottle Motor (YM)
Bottle Motor (CK)
M03 Developing Motor
Toner Log Connector
(Y,M,C,Bk)
(UN38,39,40,41)
Bottle Rotation Sensor
(Y,M,C,Bk)
(PS6,7,8,9)
ATR Sensor
(Y,M,C,Bk)
(UN34,35,36,37)
Hopper Unit
DC Controller PCB (UN04)
Developing Assembly supply count
Main Controller PCB (UN81)
Video Count Value
ATR Sensor result
Related error codes
ATR Sensor (each color) output error:
• E020-01A8: Y / E020-02A8: M / E020-03A8: C / E020-04A8: Bk
• E020-01B8: Y / E020-02B8: M / E020-03B8: C / E020-04B8: Bk
Error in take-up of Sealing Member (each color)
• E020-01C0: Y / E020-02C0: M / E020-03C0: C / E020-04C0: Bk
Toner density error when communication with the Drum Unit Memory PCB (each color) is not available
• E020-01F0: Y / E020-02F0: M / E020-03F0: C / E020-04F0: Bk
■ Driving the Toner Bottles
This machine has only 2 Bottle Motors, and toner is supplied by driving Toner Bottles of two colors alternately by one motor.
The following shows the image of the Bottle Drive Unit viewed from the back side.
2. Technology
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