User Guide

COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
5-3
CHAPTER 5 LASER EXPOSURE SYSTEM
II. GENERATING THE BD SIGNAL
The BD signal is used to enable synchronization in main scanning direction, and it is generated
by the BD PCB based on the laser beam reflected by the BD mirror found in the optical path.
The BD signal is used to send video signals from the image processor PCB to the laser
controller PCB. The laser controller PCB is designed to correct video signals, and the laser driver
PCB is used to send out video signals as laser intensity control signals in sequence.
Figure 5-201
Related Error Code
E100
The BD signal is not detected within a specific period of time.
Laser
controller
PCB
Video signal
BD
RBD
Laser driver
PCB
Laser unit
8-facet mirror
BD PCB BD mirror
ON
OFF
Guiding mirror
(front)
Laser
Photosensitive
drum
(rear)
Non-image
area
Image area
(301 mm)
BD signal
Video signal
Image processor PCB