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©
2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 3 LASER EXPOSURE SYSTEM
3-3 P
1.2 Sequence of Operations (laser exposure system)
F03-102-01
2 Generating Sync Signals
2.1 Outline
Part 2>Chapter 4>2 “Generating the BD Signal”
The BD signal used to synchronize the video signals in laser scanning direction is gener-
ated by the BD PCB with reference to the laser beam reflected by the BD mirror mounted in
the path of the laser beam.
The edge of paper re-picked in double-sided mode is detected by the horizontal registra-
tion sensor to measure the displacement to the rear/front. Based on the measurement, the
timing of laser activation is changed with reference to the BD signal so that the image will
be placed at a specific position on the paper without fail.
Main power switch ON/sleep mode OFF
Original set/ADF opened/key operated
Start key ON
180˚C
8 sec
Image leading
edge signal
Laser
PRINT
INTR
AINTR
LSTR
STBY
STBY
BD signal
Laser scanner
motor
*: If silent mode (in user mode) is selected, the motor stops after a
specific period of time.
*
