Outline - Canon GP335 Service Manual

I. OUTLINE
The laser exposure system consists mainly of the following: the laser unit, which is the source
of laser light; the laser scanner motor, which is equipped with a polygon (8-facet) mirror for
moving the laser beam; and the BD PCB, which is used to detect the laser beam.
The laser beam generated by the laser unit is directed to the polygon mirror rotating at a
specific speed. The laser beam is reflected by the polygon mirror, and then led to the
photosensitive drum by way of the laser mirror. (It is also reflected by the BD mirror for detection
by the BD PCB.)
Original exposure system
Extended image
processing system
System motherboard
SCSI
PDL
Inter-
I/F
face
Board
Board
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
No. 2 mirror
No. 3 mirror
Image processing system
Image processor PCB
FAX
Board
Laser driver
PCB
Laser exposure system
Figure 5-100
CHAPTER 5 LASER EXPOSURE SYSTEM
Scanning lamp
No. 1 mirror
No. 2 laser mirror
Laser
semiconductor
Laser light
CCD unit
Lens
CCD PCB
No. 3 laser mirror
No. 1 laser
mirror
Photosensitive
drum
5-1