Reading System - Canon DR-9080C Service Manual

II. READING
SYSTEM
1. Outline
Fig. 2-201 shows the reading system.
The reading system consists of the image
reading units and platen rollers.
The front reading unit reads the front side of
the documents and the back reading unit reads
the back side. This configuration enables the unit
Back platen roller
Reading glass
COPYRIGHT © 2003 CANON ELECTRONICS INC.
Upper reading
roller
Back reading unit
CANON DR-6080/9080C REV.0 SEPT. 2003
CHAPTER 2 FUNCTIONS & OPERATION
to read both the front and back sides of a
document at one time using a single pass.
These reading units illuminate the document
from different directions using two LEDs to
prevent shadows, and the analog image data are
internally converted to 10-bit digital signals and
then sent to the image processor on the main
CPU PCB.
The platen rollers hold the document tightly
against the reading glass to keep it in focus.
Front reading unit
Reading glass
Front platen roller
Lower reading
roller
Fig. 2-201
Document
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