Canon iR3245, Service Manual

Page: 191 / 746

Chapter 6
6-3
6.2 Basic Sequence
6.2.1 Basic Sequence
0019-4283
iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
Initial rotation INTR):
After the control panel key is ON, the machine starts the scanner motor and rotates the laser scanner motor until it reaches the number of target rotation while keeping
all laser OFF. Once it reaches the target, the machine enters stand-by mode. (FG control)
If pressing the start key before the control panel key is ON*, standby time gets shorter after the scanner motor reaches the target.
Print (PRINT)]
When copy start key is ON, the machine drives A laser. After BD PCB detects A laser, the machine performs the APC (laser intensity) control of each laser. Once
the BD signal reaches the specified cycle, the machine is ready to print. Image data is output from the main controller based on the synchronous signal and laser is
emitted corresponding to it.
In the case of A4, 1 sheet
F-6-3
PRINT STBY STBY INTR
Laser scanner
motor
PVREQ signal
Laser
Control panel key ON
(Start key ON 1 )
Start key ON
Laser A
Image per 1 line
Waiting in FG control
BD control
Light on Light off Light off Light off
Speed down
1: BD signal is generated based on A laser light. Only A laser light reaches BD sensor
on BD PCB and B/C/D laser does not reach.
Laser B
Laser C
Laser D
BD 1
Laser A
Laser B
Laser C
Laser D
: BD detection/APC control
: AP control
BD 1
Speed up