Chapter 8
8-3
- Paper Passage Temperature Control
While printing is taking place, the fixing heater temperature is controlled so that it is identical with the paper passage
control temperature target.
- Sheet-to-Sheet Temperature Control
To prevent overheating of areas not covered by paper (between sheets), the fixing heater temperature is controlled to
a level relatively lower than the paper passage control temperature
target.
- Rest Heating Temperature Control
While the machine is at rest, the fixing pressure roller is heated so that the toner collecting on it is melted and moved
to the fixing film, thereby ridding the roller of toner.
The rest heating control mechanism is used to control the temperature of the fixing heater to a level lower than the
paper passage target level when LTR or larger paper is used for printing.
The control temperature targets are switched in reference to the following 4 conditions:
- paper type (as indicated by a command during printing)
- type of control (cover paper or between sheets)
- change in fixing temperature control (OFF -> start-up -> paper passage, etc.)
- count of prints in continuous mode
8.2.2
Controlling the Fixing File Bias Temperature
8.2.2.1
Controlling the Fixing Film Bias
0006-2979
The machine is equipped with a fixing film bias control mechanism which is controlled by the CPU on the DC
controller PCB. The fixing film bias is used to prevent displacement of toner deposits; i.e., when the primary
charging roller DC bias is applied, a bias of the same polarity as the toner is applied to the fixing film so as to create
a magnetic field between the paper and the film.
F-8-4
Primary
charging
roller
CPU
DC controller PCB
Superposition
J205
Primary charging
roller
DC bias drive circuit
Primary charging
roller
AC bias drive circuit
J206
Fixing film
Photosensitive
drum
Содержание iR1200 Series
Страница 1: ...Jun 17 2004 Service Manual iR1200 Series iR1570F ...
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Страница 15: ...Chapter 1 Introduction ...
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Страница 85: ...Chapter 2 Installation ...
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Страница 96: ...Chapter 2 2 8 2 Try sending and receiving an original and check the operation and the images ...
Страница 99: ...Chapter 2 2 11 Take full care to avoid severe vibration during the relocation ...
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Страница 101: ...Chapter 3 Basic Operation ...
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Страница 117: ...Chapter 4 Original Exposure System ...
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Страница 131: ...Chapter 5 Laser Exposure ...
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Страница 139: ...Chapter 5 5 5 F 5 15 4 Remove the 4 screws 1 and detach the laser scanner unit 2 F 5 16 3 1 2 2 1 2 1 1 ...
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Страница 141: ...Chapter 6 Image Formation ...
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Страница 153: ...Chapter 7 Pickup Feeding System ...
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Страница 158: ...Chapter 7 7 2 F 7 1 PS4 PS102 PS103 PS3 PS101 ...
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Страница 187: ...Chapter 8 Fixing System ...
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Страница 209: ...Chapter 9 External and Controls ...
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Страница 256: ...Chapter 10 Original Feeding System ...
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Страница 265: ...Chapter 10 10 5 F 10 4 PS7 for jam a b or c PS8 for jam d or e PS2 for jam f ...
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Страница 323: ...Chapter 12 Standards and Adjustments ...
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Страница 337: ...Chapter 13 Correcting Faulty Images ...
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Страница 353: ...Chapter 14 Self Diagnosis ...
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Страница 405: ...Chapter 15 Service Mode ...
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Страница 487: ...Chapter 16 Service Tools ...
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Страница 489: ...Contents Contents 16 1 List of Special Tools 16 1 16 2 List of Solvents and Oils 16 2 ...
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Страница 493: ...Jun 17 2004 ...
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