Controlling The Laser Scanner Motor; Outline - Canon ImageRunner iR8500 Series Service Manual

[2]-2
The activation voltage
determined by potential
control is written into the
EEPROM.
Related Error Code
E100
(laser intensity error)

7.3.3 Controlling the Laser Scanner Motor

7.3.3.1 Outline

iR105i/iR105+ / iR9070 / iR85+ / iR8070
The laser scanner motor is controlled for the following:
[1] Constant speed rotation control
[2] Full-speed/wait rotation switching
[2]-1
Selects either laser A EEPROM
or laser B EEPROM for writing.
J1107
1
9
GND
10
LD-DT1
11
LD-DT2
12
SK
13
14
GND
15
GND
16
L-RDY-B
17
L-RDY-A
18
19
30
When the laser intently is as specified, '1'.
Clock pulses for writing to and reading from the EEPROM.
[1] See the descriptions under II. "Generating the BD Signal."
[2] The intensity of the laser fails to reach a specific level.
[1]-1
The intensity is monitored, and a voltage
suited to the intensity is fed back.
[1]-2
The output is controlled so that
the voltage fed back and the
Relay PCB
voltage from the EEPROM will
be identical.
J1714
Laser driver PCB 1
1 2 3 4 5 6
J1301
J1354
1
9
10
11
12
To
EEPROM
13
CS
14
For laser B
15
EEPROM
16
17
For laser A
18
EEPROM
19
30
Laser driver PCB 2
F-7-8
T-7-6
Chapter 7
Laser B
Intensity monitor
Laser A
0006-9537
7-7