Basic Sequence - Canon imageRUNNER 1750 Series Service Manual

2
Technical Explanation > Laser Exposure System > Basic Sequence > Basic Sequence

Basic Sequence

■ Basic Sequence
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
keepingall 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 D laser. After BD PCB detects
D laser, the machine performs the APC (laser intensity) control of each laser. Oncethe 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 isemitted corresponding to it.
<In the case of A4, 1 sheet>
Control panel key ON
(Start key ON 1 )
Start key ON
STBY INTR
Waiting in FG control
Laser scanner
Speed up
motor
PVREQ signal
Laser
Light off Light off
BD 1 BD 1
Laser D Laser D
Laser C Laser C
Laser B Laser B
Laser A Laser A
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.
2 Technical Explanation > Laser Exposure System > Basic Sequence > Basic Sequence
PRINT STBY
Speed down
BD control
Light on Light off
: BD detection/APC control
Image per 1 line
: AP control
F-2-58
2-36
2-36