At Time Of Printing; Potential Control; Overview; Copier/Printer Potential Control - Canon iR5055 Series Service Manual

7.3.2 At Time of Printing

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
Main motor (M2)
Drum motor (M1)
Laser activation
Pre-exposure LED
Primary charging
Grid bias
Developing clutch (CL4)
Developing bias (AC)
Developing bias (DC)
Dust-collecting roller bias (DC)
Pre-transfer charging bias (AC)
Pre-transfer charging bias (DC)
Transfer charging
Separation charging bias (AC)
Separation charging bias (DC)
Separation claw bias (AC)
The following shows the sequence of operation:
[1] The machine executes a series of charging operations prior to an image formation session, thus stabilizing the potential of the drum.
[2] The machine executes image formation 1.
[3] The machine executes image formation 2.

7.4 Potential Control

7.4.1 Overview

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The machine uses the following functions and control mechanisms associated with its potential control system:

1. copier/printer potential control

2. APC (auto power control) correction
3. primary current determination (VD control)
4. laser output determination (VL control)
5. post-laser illumination potential measurement (VDC control)
The following shows the construction of the machine's control system associated with potential control:
The following signals are associated with potential control:
[1] POT-DT, drum surface potential measurement
[2] POT-ON, if '1', turns on the potential sensor
7.4.2 Copier/Printer Potential Control
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
Start key ON
STBY INRT
Laser output level determination
Control
signal
Primary charging wire
Control
Primary current determination
signal
J103
Developing bias (DC) determination
0V
B4
[1]
POT-DT
B3
POT-ON
[2]
B2
24V
B1
PRINT
[1] [2] [3]
F-7-4
Developing cylinder
J3
F-7-5
LSTR STBY
Laser light
Potential
sensor
1
2
3
4
Chapter 7
0015-4477
0015-4479
0015-4480
7-3