Canon ImageCLASS MF4690 Service Manual - page 41
Chapter 3
3-1
3.1 Basic Constraction
3.1.1 Specifications / Control / Function List
0016-1813
T-3-1
3.1.2 Major Components
0016-1815
Followings are the major components for Document Exposure System.
- The contact sensor to scan document
- The Book motor (M2), the drive pulley, the drive belt, to shift the contact sensor
In image scanning control, the contact sensor is shifted by rotating the Book motor based on the drive signal from the DCNT board and scan the original on the
copyboard glass. When ADF is in use, image is scanned by feeding the originals by ADF instead of shifting the contact sensor.
item
function / method
document exposure
LED
document scan
Book mode: scan by the shift of the contact Book mode: scan by the shift of the contact sensor (CS)
ADF: document stream reading by fixed contact sensor (CS)
scanning resolution
600 dpi (horizontal scanner) X 600 dpi (vertical scanner)
number of gradations
256 gradations
magnification
50% to 200%
horizontal: image processing by SCNT board
vertical: change of carriage shift speed, image processing by SCNT board
lens
rod lens array
CMOS sensor
number of lines: 1 line
number of pixels: 5184 pixels as total pixels (5107 pixels as effective pixels)
maximum document scanning width: 216 mm
CS drive control
drive control by Book motor (M2)
CS HP detection
Yes
document size detection
none
Dirt sensor detection
Yes