Various Controls; Controlling The Laser Activation Timing; Laser Emission On/Off Control - Canon iR2020 Series Service Manual

Image Processor
PCB

5.2 Various Controls

5.2.1 Controlling the Laser Activation Timing

5.2.1.1 Laser Emission ON/OFF Control

iR2016 / iR2020 / iR2016i / iR2020i
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, VDO2, and /VDO2). 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 Laser Emission ON/OFF Control

iR2016J /
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).
J206
[1]
Laser control signal Laser status
CTL2 CTL1 CTL0 Laser A
0 0 0 OFF
Video signal input
1 1 1
enable
1 1 0 ON
1 0 1 OFF
1 0 0 ON
0 1 0 ON
0 0 1 OFF
0 1 1 OFF
DC Controller PCB
IC5
J205
[2]
[4]
F-5-2
T-5-4
Description
Laser B
OFF Laser control OFF
Laser beams can be emitted in
response to video signals.
Forced emission of laser A (for
OFF
adjustment in factory)
Forced emission of laser B (for
ON
adjustment in factory)
Forced emission of laser A and
ON laser B (for adjustment in
factory)
OFF APC over laser A
ON APC over laser B
OFF Forced stop of laser emission
Chapter 5
[3]
0010-7720
0011-2155
5-3