
Chapter 5
5-4
5.2 Various Controls
5.2.1 Controlling the Laser Activation Timing
5.2.1.1 Laser Emission ON/OFF Control
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The purpose of this control is to turn ON/OFF the laser diode (LD) in response to video signals.
The DC controller PCB sends laser control signals (CNTRL0, CNTRL1, and CNTRL2), which are used to switch between laser driver operation modes, to the laser
driver IC along with video signals (VDO1, /VDO1). The laser driver IC controls laser emission (ON/OFF) according to the combination of CNTRL0, CNTRL1,
and CNTRL2 signals.
The following table shows combinations of laser control signals (CNTRL0, CNTRL1, and CNTRL2).
5.2.1.2 Horizontal Synchronization Control
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The purpose of this control is to adjust the position where scanning starts in the horizontal direction (main scan direction) of the image with reference to the hori-
zontal synchronization signal (/BD) sent from the BD sensor in the laser scanner. The horizontal synchronization signal is also used as a vertical synchronization
signal to recognize the leading edge of paper. Upon detection of arrival of the fed paper at the prescribed position, the DC controller PCB starts sending the /BD
signal to the image porcessor PCB. The image processor PCB recognizes the leading edge of paper at the start of the continuous /BD signal; it recognizes the trailing
edge of paper at the end of the continuous /BD signal.
5.2.2 Controlling the Intensity of Laser Light
5.2.2.1 Automatic Photocurrent Control (APC)
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The purpose of this control is to monitor the laser beam emitted to the photodiode on the laser driver circuit board in order to adjust the light quantity.
Laser control signal
Laser
status
Description
CTL2
CTL1
CTL0 Laser A
0
0
0
OFF
Laser control OFF
0
0
1
ON
Laser beams can be emitted in
response to video signals.
0
1
0
ON
APC over laser
0
1
1
OFF
Forced stop of laser emission
Содержание iR2318 series
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