Generating Sync Signals; Outline - Canon Image Reader-A1 iR5000i Service Manual

CHAPTER 3 LASER EXPOSURE SYSTEM

2. Generating Sync Signals

2.1 Outline

The BD signal used to synchronize video signals for laser scanning direction is generated
by the BD PCB with reference to the laser beam reflected by the BD mirror, mounted along
the path of the laser beam.
The CCD/AP PCB reads image signals from the CCD, and sends them to the controller
unit. The controller unit performs image processing, and the signals are sent to the laser
driver PCB as video signals through the DC controller PCB; they are then sent to the laser
unit as laser intensity control signals in sequence.
BD mirror
3-4 P
Photosensitive drum
F03-201-01 Construction of the Control System
COPYRIGHT © 2001 CANON INC.
Laser unit
BD PCB
2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001
12-facet polygon
mirror