Protection Function - Canon imageCLASS MF269dw Service Manual

RL101
Fixing heater
control circuit

Protection Function

Overview
This machine has a function to detect abnormal temperature rise in the Fixing Unit and cut off the power supply to the Fixing
Heater.
Description
This machine is equipped with 4 types of protection function as follows.
• DC Controller
• Fixing Heater safety circuit
• Thermoswitch
• Down Sequence Control
Low Voltage Power Supply PCB
Zerocross circuit
（220 to 240V only）
Relay control
circuit
Fixing film unit
TH1 TP1
H1
Pressure roller
48
Engine controller PCB
FREQSNS
DC controller
Fixing heater
RLYD
safety circuit
FSRD
FSRTHSNS
Fixing unit
TP1 ： Thermoswitch
TH1 ： Thermistor
H1 ： Fixing Heater
2. Technology
CPU