Canon MultiPASS C50, Service Manual

Page: 84 / 272

Names and Functions of Parts
1. Paper Guide
When properly adjusted to the width of the documents, the guide will hold the documents in the
horizontal direction to prevent them from skewing when fed.
2. Document Feed Motor
This motor drives all the rollers in the scanner section.
3. Document Sensor (DS)
This sensor uses an actuator to detect the presence of documents to be scanned, and sends that
information to the SCNT board by way of the gate array in the operation panel unit.
4. Document Stopper
This stopper is located to the side of the separation rollers, and prevents documents from entering too far
inside the scanning section. This stopper is located here to improve document loading and prevent double
feeding or non-feeding due to defective loading of documents.
5. Separation Guide
Separates the documents to prevent double-feeding.
6. Document Feed Lever
➔ ➔
See next page.
This lever switches between automatic document feed and manual document feed. Damage to the
document caused by the separation roller can be minimized by switching to the manual document feed
position when sending single sheets such as thick-stock paper or photographs.
7. Separation Roller
This roller uses differences in the coefficients of friction of the separation guide, document and separation
roller to separate each of the sheets in a multiple-page document.
8. Upper Document Feed Roller
➔ ➔
See next page.
When the separation roller starts to rotate, the upper document feed roller raises the document stopper so
that documents can be fed.
9. Document Edge Sensor (DES)
Using an actuator, the DES detects the edge of a document just before it reaches the contact sensor, and
sends this information to the SCNT board.
10. Document Feed Roller
This roller feeds documents to the color contact sensor after they are separated by the separation roller.
11. White Sheet
This white sheet is used as a whiteness reference when pre-scanning documents.
12. Color contact Sensor
➔ ➔
See page 2-34
The color contact sensor scans the image data from the document, converts it to serial data, and transmits
it to the SCNT board as electrical signals. The color contact sensor has a scanning resolution of true 300
dpi and outputs Red, Green and Blue analog image data.
13. Upper Document Eject Roller
Holds the document between the document eject rollers, and then ejects it.
14. Document Eject Roller
This roller ejects documents fed from the document feed roller.
15. Static Eliminator Brush
Removes static electricity which may have built up on the document in the scanning process, and guards
against roller jams.
Part 1: Facsimile
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