Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 44 / 987

Scanner Unit
■ Configuration of the Scanner Unit
The Scanner Unit has the same mechanism as that of the reader. This equipment uses a Scanner Unit that integrates an LED,
mirror, lens, and Reading Sensor to perform original exposure and reading.
Light emitted from LED is reflected by the original and reaches the Reading Sensor through the Reflection Mirror and the Lens
Unit.
Note that there is a difference in externals of the unit for the ADF and that for the reader due to the shapes of the locations where
they are installed; therefore, they cannot be exchanged.
Scanner Unit
(ADF)
Scanner Unit
(Reader)
Scanning position
for the front side
Scanning position
for the rear side
The Reading Sensor consists of 3 lines (R, G, and B) and all lines are used at reading.
Related error codes
E302 - 000x: Error in paper front shading
• E302 - 0001: Error in paper front white shading
• E302 - 0002: Error in paper front black shading
• E302 - 0003: Error in paper front shading
E302 - 010x: Error in paper back shading
• E302 - 0101: Error in paper back white shading
• E302 - 0102: Error in paper back black shading
• E302 - 0103: Error in paper back shading
● Scanner Unit
This equipment uses a Scanner Unit that integrates an LED, mirror, lens, and Reading Sensor to perform original exposure and
reading.
Light emitted from LED is reflected by the original and reaches the Reading Sensor through the Lens Unit.
Scanner Unit
(ADF)
Scanner Unit
(Reader)
The Reading Sensor consists of 3 lines (R, G, and B) and all lines are used at B&W and color reading.
2. Technology
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