Chapter 7
7-8
1. Adjusting the Density for Copying
The machine increases the developing bias to decrease the copy density. If increased in excess, the bias can cause light images; if decreased in excess, on the other
hand, the background can developing fogging. In light of this, the machine executes density processing using changes in the developing bias and image processing
(binary density processing).
Purpose: to obtain the density suited to the user's needs.
Method of correction: uses the developing bias and image processing (binary density processing) according to the F-value setting.
T-7-5
2. Adjusting the Density for Printing
The machine increases the developing bias to increase the print density. If increased in excess, the background can develop fogging. At the lower limit of the de-
veloping bias, the machine uses the changes in the developing bias and image processing (thickening processing) to ensure appropriate density.
Purpose: to obtain the density suited to the user's needs.
Method of correction: uses the developing bias and image processing (thickening) to suit the F-value setting.
T-7-6
*1: Thickening processing may be enabled for all F values in user mode ('correct fine line').
7.5 Charging Mechanism
7.5.1 Controlling Pre-Exposure LED
7.5.1.1 Pre-Exposure LED Control
0015-4487
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The machine is equipped with a pre-exposure LED used to prevent adhesion of excess toner on the photosensitive drum because of residual charges. The following
is an item associated with the pre-exposure LED control system:
1. turning on/off the pre-exposure LED
F value
Developing DC bias standard value
(V)
Shift (V)
Image processing
Image density
1
240
60
yes lighter
2
220
40
no
3
180
0
no
4
140
-40
no
5
120
-60
yes
darker
F value
Developing DC bias standard
value (V)
Shift (V)
Thickening*1
Image density
1
218
48
no
light
2
205
35
no
3
194
24
no
4
182
12
no
5
170
0
no
6
153
-17
no
7
137
-33
no
8
120
-50
no
9
120
-50
yes
dark
Summary of Contents for iR5055
Page 1: ...Feb 29 2008 Service Manual iR5075 5065 5055 Series ...
Page 2: ......
Page 6: ......
Page 27: ...Contents 19 1 2 List of Solvents Oils 19 2 ...
Page 28: ...Contents ...
Page 29: ...Chapter 1 Introduction ...
Page 30: ......
Page 32: ......
Page 59: ...Chapter 2 Installation ...
Page 60: ......
Page 104: ...Chapter 2 2 42 F 2 156 2 1 ...
Page 105: ...Chapter 3 Basic Operation ...
Page 106: ......
Page 108: ......
Page 115: ...Chapter 4 Main Controller ...
Page 116: ......
Page 118: ......
Page 135: ...Chapter 5 Original Exposure System ...
Page 136: ......
Page 169: ...Chapter 6 Laser Exposure ...
Page 170: ......
Page 172: ......
Page 178: ......
Page 179: ...Chapter 7 Image Formation ...
Page 180: ......
Page 184: ......
Page 217: ...Chapter 8 Pickup Feeding System ...
Page 218: ......
Page 274: ......
Page 275: ...Chapter 9 Fixing System ...
Page 276: ......
Page 280: ......
Page 320: ......
Page 321: ...Chapter 10 External and Controls ...
Page 322: ......
Page 326: ......
Page 336: ...Chapter 10 10 10 F 10 7 2 Remove the check mark from SNMP Status Enabled ...
Page 337: ...Chapter 10 10 11 F 10 8 ...
Page 361: ...Chapter 11 MEAP ...
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Page 409: ...Chapter 12 e maintenance imageWARE Remote ...
Page 410: ......
Page 412: ......
Page 421: ...Chapter 13 Maintenance and Inspection ...
Page 422: ......
Page 424: ......
Page 433: ...Chapter 14 Standards and Adjustments ...
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Page 464: ......
Page 465: ...Chapter 15 Correcting Faulty Images ...
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Page 468: ......
Page 496: ......
Page 497: ...Chapter 16 Self Diagnosis ...
Page 498: ......
Page 500: ......
Page 528: ......
Page 529: ...Chapter 17 Service Mode ...
Page 530: ......
Page 532: ......
Page 600: ......
Page 601: ...Chapter 18 Upgrading ...
Page 602: ......
Page 604: ......
Page 636: ...Chapter 18 18 32 F 18 59 2 Select the data to download F 18 60 3 Click Start ...
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Page 639: ...Chapter 19 Service Tools ...
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Page 645: ...Feb 29 2008 ...
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