Protective Functions; Power Break Due To Thermo-Switch Operation At Unusual Temperature Rise - Canon imagerunner C5180 Service Manual

11.4 Protective Functions

11.4.1 Power break due to thermo-switch operation at unusual temperature rise.

The contact of thermo-switch does not recover once opened. Replace it instead of re-using it.
The machine is equipped with the following protective mechanisms to detect overheating of the fixing
assembly, thus cutting off the power to the heater:
1.DC controller (CPU)
2.ASIC
3.thermal switch
(fixing thermal switch rated at 236 +/-8; pressure thermal switch rated at 238 +/-8)
2
1
2
3
1
2
3
CPU
IH drive circuit
ASIC
DC CONTROLLER1
F-11-18
+13V
TP1
IH drive circuit
IH power supply circuit PCB
+13V
AC driver circuit board PCB
Chapter 11
IH
TP3
11-31