Overview - Canon imageRUNNERC1022 Service Manual

Chapter 7

7.2.2 Overview

Color imageRUNNER C1030 / Color imageRUNNER C1030iF
The laser control is to allow the laser driver to turn the laser diode ON/OFF according to the laser control signals sent from the DC controller.
There are two laser driver PCBs: one is for M/C and the other is for Y/Bk. The configurations of both PCBs are identical.
In the case of the laser driver for M/C
DC controller PCB
+5V
+5V
The DC controller sends the following signals to each laser driver IC (IC1, IC2).
- video signals (VDO, /VDO) for the image formation
- laser control signals (CTRL 0 to 2) for switching the operational mode of the laser driver circuit
- laser light intensity switch signal (LD_PWM) for switching the laser light intensity
The laser driver IC controls the laser according to the combination of the laser control signals.
7-6
LD_PWM
LD2CTRL0
LD2CTRL1
LD2CTRL2
VDO21,/VDO21
VDO22,/VDO22
LD2PDOUT
LD1CTRL0
LD1CTRL1
LD1CTRL2
VDO11,/VDO11
VDO12,/VDO12
LD1PDOUT
/BD1I
Laser driver PCB
Cyan laser driver circuit
Light intensity
switching
circuit
LD1
IC2
PD
LD2
C14
Magenta laser driver circuit
LD1
IC1
PD
LD2
C8
F-7-4
LD2
LD1 BD circuit
0025-8724