Canon iR7086, Service Manual

Page: 197 / 735

Chapter 5
5-11
5.3.2.2 Changing the Reproduction Ratio in Sub Scanning Direction
0010-7890
iR7105 / iR7095
To execute scaling, the moving speed of the mirror 1 mount is changed.
Also, digital scaling is concurrently used under the following conditions:
- Fixed reading: scaling is from 25 to 99.9%
- Stream reading: scaling is from 25 to 88.9%
MEMO:
Stream reading is basically executed when a copy is made with the ADF. However,
fixed reading is executed instead if scaling is from 25 to 49.9% or a 2-sided copy is made at any scaling factor. Fixed reading is executed whenever a copy is made
in book mode.
5.3.2.3 Changing the Reproduction Ratio in Sub Scanning Direction
0011-2185
iR7086
To execute scaling, the moving speed of the mirror 1 mount is changed.
Also, digital scaling is concurrently used under the following conditions:
- Fixed reading: scaling is from 25 to 99.9%
- Stream reading: scaling is from 25 to 50%
5.3.3 Controlling the Scanning Lamp
5.3.3.1 Overview
0010-7891
iR7105 / iR7095
The following shows the items of control and the components of the control system associated with the activation of the scanning lamp:
1) Controlling the Activation
The machine turns on or off the scanning lamp using the drive signal (XE-ON) generated by the CPU on the reader controller PCB. In response to the signal,
the inverter PCB generates high-frequency high voltage in the activation motor circuit using the drive voltage (+24 V) supplied by the reader controller PCB,
thus turning on the scanning lamp.
2) Detecting an Error
The machine identifies an error in the intensity of light as an activation error occurring when the lamp is initially turned on (shading correction).
ERROR CODE:
E225
-0001: at time of shading, the detected intensity of light falls short of a specific level.
-0002: in ADF mode, the intensity of light between originals falls short of a specific level.
F-5-20
5.3.3.2 Overview
0010-7892
iR7086
The following shows the items of control and the components of the control system associated with the activation of the scanning lamp:
1) Controlling the Activation
The machine turns on or off the scanning lamp using the drive signal (XE-ON) generated by the CPU on the reader controller PCB. In response to the signal,
the inverter PCB generates high-frequency high voltage in the activation motor circuit using the drive voltage (+24 V) supplied by the reader controller PCB,
thus turning on the scanning lamp.
2) Detecting an Error
The machine identifies an error in the intensity of light as an activation error occurring when the lamp is initially turned on (shading correction).
ERROR CODE:
E225
-0001: at time of shading, the detected intensity of light falls short of a specific level.
-0002: in ADF mode, the intensity of light between originals falls short of a specific level.
F-5-21
5.3.3.3 Scanning Lamp
0010-7894
iR7105 / iR7095 / iR7086
The machine's scanning lamp is a xenon lamp consisting of a tube in which xenon gas is sealed. On the inner side of the glass tube are 2 electrodes running parallel
Inverter PCB
Scanning lamp
Reader control
PCB
J601 J203
Activation control circuit
LA1
CPU
GND
GND
GND
GND
XE-ON
24V
24V
XSYNC
24V
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
Inverter PCB
scanning lamp
Activation
control
circuit
J601 J206
Reader controller PCB
LA1
CPU
GND
GND
GND
GND
XE-ON
24V
24V
XSYNC
24V
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9