Chapter 8
8-2
8.2
Various Control Mechanisms
8.2.1
Controlling the Fixing Roller Temperature
8.2.1.1
Controlling the Fixing Temperature
0006-2977
The fixing film unit has a plate-shaped fixing heater built into it for heating the fixing film.
The fixing heater is equipped with 2 thermistor: a main thermistor in the middle and a sub thermistor at the end. The
main thermistor is used to control the temperature of the fixing heater and to detect its overheating, while the sub
thermistor is used to detect an error temperature on the end of the fixing heater.
The CPU on the DC controller PCB monitors the main thermistor signal (FSRTH) and the sub thermistor signal
(SUBTH) from the thermistors for control of the fixing heater drive signal (FSRD0) and the relay drive signal
(RLYD), thus varying the supply of power to the heater and, ultimately, controlling the temperature of the fixing
heater.
F-8-3
The CPU on the DC controller PCB executes the following 4 types of fixing temperature control:
- Start-Up Temperature Control
In response to a print command from the image processor PCB, the temperature of the fixing heater is started up to
a level 15 deg C/59 deg F lower than paper passage control temperature target.
Fixing assembly
Fixing
heater
Sub
thermistor
Main
thermistor
DC controller PCB
Power supply PCB
SUBTH
FSRTH
CPU
+3.3V
FSRDO
RLYD
+24V
Image processor PCB
Fixing heater high tempe-
rature error detection
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 ...
Страница 311: ...Chapter 11 Maintenance and Inspection ...
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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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