
Chapter 8
8-13
F-8-18
F-8-19
T-8-7
F-8-20
2. Potential Control during High Humidity Mode
Related Service Mode
COPIER > OPTION > BODY > CNT-
W/PR (density setting mode on/off
during printing)
0: correct the target value to enable variation of density
during printing. (default)
1: disable the mechanism used to vary the density during
printing.
1
2
3
4
5
6
7
8
9
x0.8
x0.9
x1.0
x1.1
x1.2
x1.3
x1.4
x1.5
x1.5
+40V
+30V
+20V
+10V
F value
Density
Darker
Lighter
The laser power is increased
(to increase the contrast),
thereby enabling reproduction
of fine lines narrower than a
single particle of toner.)
The laser power/developing
bias is corrected to suit the F
value setting.
The laser power has
reached the upper limit,
requiring correction of
the developing bias to
increase the contrast.
Laser power
correction
value
Vdc
correction
value
VD
correction
value
WMUPR
WMUP
STBY
195˚C
200˚C
Potential sensor
Laser
Grid bias
Vg
Vg
Pw
Pw Vdc
VD
VL
Potential determined
The laser power/developing
bias is corrected to suit the F
value setting.
Potential control
sequence started
COPIER > OPTION > BODY > CNT-W/PR
Set
Potential
control
Printing
started
Main power switch
OFF/ON
F value
changed
A laser power output Vdc
suited to the F value setting
is used.
Summary of Contents for ImageRunner iR8500 Series
Page 1: ...Apr 5 2005 Service Manual iR8500 Series ...
Page 2: ......
Page 6: ......
Page 32: ...Contents ...
Page 33: ...Chapter 1 Introduction ...
Page 34: ......
Page 98: ......
Page 99: ...Chapter 2 Installation ...
Page 100: ......
Page 180: ...Chapter 2 2 78 F 2 272 2 1 1 3 ...
Page 181: ...Chapter 3 Basic Operation ...
Page 182: ......
Page 184: ......
Page 207: ...Chapter 4 Main Controller ...
Page 208: ......
Page 245: ...Chapter 4 4 35 F 4 72 1 2 ...
Page 246: ......
Page 247: ...Chapter 5 Original Exposure System ...
Page 248: ......
Page 252: ......
Page 306: ......
Page 307: ...Chapter 6 Image Processing System ...
Page 308: ......
Page 310: ......
Page 319: ...Chapter 7 Laser Exposure ...
Page 320: ......
Page 322: ......
Page 335: ...Chapter 8 Image Formation ...
Page 336: ......
Page 340: ......
Page 399: ...Chapter 9 Pickup Feeding System ...
Page 400: ......
Page 404: ......
Page 482: ......
Page 483: ...Chapter 10 Fixing System ...
Page 484: ......
Page 524: ......
Page 525: ...Chapter 11 External and Controls ...
Page 526: ......
Page 530: ......
Page 583: ...Chapter 12 MEAP ...
Page 584: ......
Page 586: ......
Page 589: ...Chapter 13 Maintenance and Inspection ...
Page 590: ......
Page 592: ......
Page 610: ...Chapter 13 13 18 F 13 17 1 2 3 ...
Page 648: ......
Page 649: ...Chapter 14 Standards and Adjustments ...
Page 650: ......
Page 654: ......
Page 723: ...Chapter 15 Correcting Faulty Images ...
Page 724: ......
Page 728: ......
Page 792: ......
Page 793: ...Chapter 16 Self Diagnosis ...
Page 794: ......
Page 796: ......
Page 841: ...Chapter 17 Service Mode ...
Page 842: ......
Page 1076: ......
Page 1077: ...Chapter 18 Upgrading ...
Page 1078: ......
Page 1080: ......
Page 1108: ...Chapter 18 18 28 F 18 45 3 Click Start F 18 46 4 Click Save F 18 47 5 Click OK ...
Page 1111: ...Chapter 19 Service Tools ...
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Page 1120: ......
Page 1121: ...Apr 5 2005 ...
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