Overview; Copier/Printer Potential Control - Canon imageRUNNER 5065 series Service Manual

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 / / /
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 / / /
A. Timing and particulars of potential control
1. At the time of warm-up
The machine's potential control consists of copier potential control mechanisms and printer potential control mechanisms.
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
0015-4479
0015-4480
7-3