Chapter 7
7-5
7.4 Potential Control
7.4.1 Overview
0009-3538
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:
F-7-5
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
0009-3540
The machine's potential control consists of copier potential control mechanisms and printer potential control mechanisms.
The machine uses VD=390V for both copier and printer control mechanisms.
The timing of potential control is as follows:
T-7-3
If enabled in service mode, potential control starts 10 min and 60 min after the main power switch is turned on or when the door is opened and closed. The
timing and particulars of potential control are as follows:
At time of warm-up
Purpose
to execute potential control for copier/printer mode
to determine a constant value for copier/printer mode
Operating condition
- the temperature of the fixing assembly is 50 deg C or lower
when the main power switch is on
- when the first image is being formed 60 min after warm-up
Operation length
10 sec (approx.)
Service mode
may be enabled or disabled using the following:
COPIER>OPTION>BODY>PO-CNT
Default
ON (potential control for both copier and printer modes)
Primary charging wire
Potential
sensor
Laser light
Developing cylinder
DC controller PCB
Laser driver PCB
Developing cylinder
Potential control PCB
Control
signal
Control
signal
Detection signal
J103
J3
1
2
3
4
B1
B2
B3
B4
0V
24V
POT-DT
POT-ON
[1]
[2]
Developing bias (DC) determination
Laser output level determination
Primary current determination
Summary of Contents for iR5570 Series
Page 1: ...Mar 29 2005 Service Manual iR6570 5570 Series ...
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Page 26: ...Contents ...
Page 27: ...Chapter 1 Introduction ...
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Page 55: ...Chapter 2 Installation ...
Page 56: ......
Page 58: ...Contents 2 9 3 Mounting the Cassette Heater 2 34 ...
Page 98: ......
Page 99: ...Chapter 3 Basic Operation ...
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Page 111: ...Chapter 4 Main Controller ...
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Page 135: ...Chapter 5 Original Exposure System ...
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Page 181: ...Chapter 6 Laser Exposure ...
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Page 193: ...Chapter 7 Image Formation ...
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Page 259: ...Chapter 8 Pickup Feeding System ...
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Page 351: ...Chapter 9 Fixing System ...
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Page 401: ...Chapter 10 External and Controls ...
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Page 449: ...Chapter 11 MEAP ...
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Page 455: ...Chapter 12 Maintenance and Inspection ...
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Page 469: ...Chapter 13 Standards and Adjustments ...
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Page 505: ...Chapter 14 Correcting Faulty Images ...
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Page 537: ...Chapter 15 Self Diagnosis ...
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Page 565: ...Chapter 16 Service Mode ...
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Page 633: ...Chapter 17 Upgrading ...
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Page 641: ...Chapter 17 17 5 F 17 4 HDD Boot ROM Flash ROM System Software ...
Page 646: ...Chapter 17 17 10 F 17 11 8 Click START F 17 12 ...
Page 675: ...Chapter 17 17 39 F 17 59 2 Select the data to download F 17 60 3 Click Start ...
Page 677: ...Chapter 18 Service Tools ...
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