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Technical Overview > Fixing System > Controls > Fixing Speed Control
Technical Overview > Fixing System > Controls > Fixing Speed Control
Fixing System
Overview
The fixing power supply controls temperatures of the Fixing Assembly.
This product employs the on-demand fixing method in the Fixing Assembly. The figure below
shows the structure schematically.
TH802
FU1
H801
FIXING
HEATER
DRIVE signal
Fixing control
circuit
FIXING TEMPERATURE signal
Pressure roller
Fixing film
DC controller
Fixing
power supply
Fixing heater
safety circuit
Name
MF8500 MF8200
Role
Fixing heater
100V
H100
T801
To heat the fixing film
120V
H120
230V
H220
Main thermistor
TH801
TH802 To detect the fixing heater temperature
(center of the heater, contact thermistor)
Sub thermistor 1
TH802
-
To detect the fixing heater temperature
(heater ends, contact thermistor)
Sub thermistor 2
TH803
-
Temperature fuse
FU1
To prevent abnormal temperature rise in the
fixing heater
The temperature fuse is attached to the center of the fixing heater.
When the fixing heater comes to be abnormally hot, the temperature fuse is open to shut off
the power supply to the fixing heater.
The thermistor detects the fixing heater temperature to input the temperature detection signal
to the DC controller. Note that temperatures at heater ends are not detected in models of
MF8200 series with slower print speed.
The temperatures in the whole fixing assembly are controlled by the fixing control circuit and
the fixing heater safety circuit based on commands from the DC controller.
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Controls
■
Fixing Speed Control
●
Reduction of Throughput Based on Detected Temperature of Sub
Thermistor
Paper interval extension time is determined based on the detected temperature of the Sub
Thermistor.
Paper interval extension time determined by the detected temperature of the Sub Thermistor
is added to the paper interval extension time derived from the paper width detection result
and paper length detection result.
Detection of temperature by the Sub Thermistor is performed when the Delivery Sensor turns
OFF.
When the Paper Width Sensor is ON, reduction of throughput based on the detected
temperature of the Sub Thermistor is not executed.
Tempreture of Sub Thermistor: Tx
Paper interval (sec)
T1
3
T2
6
T3
9
T4
15
Note :
• With MF8200 series, this control is not executed since detection of temperature by the
Sub Thermistor is not performed.
• Tempreture of Sub Thermistor: T1 < T2 < T3 < T4
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Содержание Color imageCLASS MF8280Cw
Страница 12: ...1 1 Product Overview Product Overview Product Lineups Product Features Specifications Name of Parts ...
Страница 317: ...5 5 Adjustment Adjustment Overview Adjustment at Parts Replacement ...
Страница 326: ...6 6 Trouble Shooting Trouble Shooting Test Print Trouble shooting items Special Management Mode Version Upgrade ...
Страница 340: ...7 7 Error codes Error codes Overview Error Codes Jam Code ...
Страница 349: ...8 8 Service Mode Service Mode Overview COPIER FEEDER FAX TESTMODE ...
Страница 394: ... Special Tools Solvents and Oils General Circuit Diagram Backup Data Appendex ...