Measurements Against Heating Of Fixing Tension Roller - Canon imagerunner C5180 Service Manual

Chapter 11
IH Power Upper limit
Fixing sub-thermistor 1/2 Less than 215 deg C 215 deg C
2. Temperature rise control at end of Pressure heater *1
If either the pressure sub-thermistor 1 (TH5) or the pressure sub-thermistor 2 (TH6) detects 215 deg C or higher,
the pressure heater is turned to off.
If both the pressure sub-thermistor 1 (TH5) and the pressure sub-thermistor 2 (TH6) are less than 215 deg C, the
temperature in print mode is controlled.
*1: Only for iR C5180 and iR C4580/4080 (230 V)
Pressure sub-thermistor 1/2

11.2.2.7 Measurements against heating of fixing tension roller

Objective
- To detect the high-temperature error by bringing fixing sub thermistor into contact with tension roller if the
fixing belt becomes torn.
- To detect high-temperature error by fixing sub thermistor 2 as fixing tension roller (metal) temperature
becomes higher than the inside of the belt at the time of start-up.
These operations against the heating of tension roller are conducted during warm-up, recovery mode, and stand-
by.
[1] Step 1
The system lowers the electric power capacity on the IH heater when either of sub thermistor 1 (TH2) or sub
thermistor 2 (TH3) detects the temperature higher than 215 deg C. (electric capacity *1 in the print mode ->
700W)
The system recovers the electric capacity when both of sub thermistor 1 (TH2) or sub thermistor 2 (TH3) detect
the temperature lower than 215 deg C. (700W -> electric capacity *1 in the print mode)
[2] Step2
The system sets the electric power capacity on the IH heater 0W when either of sub thermistor 1 (TH2) or sub
thermistor 2 (TH3) detects the temperature higher than 220 deg C.
The system goes to the step [1] when both of sub thermistor 1 (TH2) or sub thermistor 2 (TH3) detect the
temperature lower than 215 deg C.
IH electric capacity
Fixing sub-thermistor 1/2
11-16
T-11-17
IH Power at normal IH Power Upper limit /
Temperature 1 to change
1100 W 500 W
T-11-18
Pressure heater forced off temperature
215 deg C
T-11-19
temperature to change IH
electric capacity 1
700 W
215 deg C
IH Power Upper limit /
Temperature 2 to change
0 W
220 deg C
temperature to change IH
electric capacity 2
0 W
220 deg C