Overview/Configuration; Overview; Parts Replacement Procedure; Separation Guide Unit - Canon L90 Series Service Manual

2.1 Overview/Configuration

2.1.1 Overview

Reading from the ADF
To avoid skew feeding, documents loaded on the document tray are
retained in the horizontal direction by the slide guide. Then, the
documents are separated one sheet each using differences in the
coefficient of friction among the separation roller, documents, and
separation guide.
After that, the feeder roller feeds the document onto the reading glass,
and the Contact sensor reads out image data of the document; then, the
delivery roller delivers it to the delivery tray.
The document feed motor drives the various rollers of the ADF.

2.2 Parts Replacement Procedure

2.2.1 Separation Guide Unit

2.2.1.1 Preparation for Removing the Scraper

1) Remove the document feed tray and the paper tray cover. (page 7-2)Ref-
erence[Removing the Document Feed Tray and the Paper Tray Cover]
2) Detach the right cover. (page 7-2)Reference[Detaching the Right Cov-
er]
3) Detach the left cover. (page 7-2)Reference[Detaching the Left Cover]
4) Detach the front cover. (page 7-1)Reference[Detaching the Front Cov-
er]
5) Detach the rear cover. (page 7-1)Reference[Detaching the Rear Cover]
6) Detach the cartridge cover. (page 7-3)Reference[Detaching the Car-
tridge Cover]
7) Remove the control panel unit. (page 7-4)Rference[Removing the Con-
trol Panel Unit]
8) Detach the upper cover. (page 7-3)Reference[Detaching the Upper Cov-
er]
9) Remove the reader unit. (page 2-5)Reference[Removing the Reader
Unit]
F-2-1
[1] Separation guide
[2] Separation roller
[3] Document feed roller
0018-4898
[4] Contact sensor
[5] Document delivery roller

2.2.1.2 Removing the Scraper

1) Free the claw [1], and detach the upper reader unit frame [2].
2) Free the harness [1] from the cable guide [2].
3) Remove the 7 screws [3], and detach the cover [4].
0018-4167
[2]
4) Free the 2 claws [1], and detach the Separation guide unit [2].
T-2-1
[2] [1]
F-2-2
[3]
[1] [3] [4]
F-2-3
Chapter 2
0018-4168
2-1