Canon imageRUNNER ADVANCE 4551i Service Manual page 117

Item
Protective Function
*1. Target temperature is specified depending on the process speed, the fixing mode and the fixing temperature at the start of
warm-up control.
■ Major parts configuration
Fixing Pressure
Release Sensor
Fixing Outlet Sensor
(S19)
Symbol
- Film unit
- Pressure roller
H1/H2 Fixing heater
TH1 Main thermistor
TH2 Sub thermistor (front)
TH3 Sub thermistor (rear)
TP1 Thermo Switch
S19 Fixing outlet sensor
S53 Fixing Pressure Release Sensor
"Main thermistor and Sub thermistors (front)/(rear)
Thermo Switch (operating temperature: 250 deg C)"
Pressure Roller
(S53)
Fixing Heater
(H1, H2)
Part name
Function/method
Film Unit
Thermoswitch
(TP1)
Fixing Main
Thermistor
(TH1)
Fixing Sub
Thermistor 1
Function / method
Applying heat and pressure makes the toner image on paper fixed
(fused).
Ceramic heater
To be in contact with the heater
Temperature control, detection of abnormal temperature rise
To be in contact with the heater (non-feeding area)
Temperature control, detection of abnormal temperature rise, tem-
perature detection/cooling control on the edges
To be in contact with the heater (non-feeding area)
Temperature control, detection of abnormal temperature rise, tem-
perature detection/cooling control on the edges
Non-contact type with the heater
To block AC electric power supply when a failure is detected.
Jam detection
Detect the engagement/disengagement status of the Film Unit
104
2. Technology
(TH2)
Fixing Sub
Thermistor 2
(TH3)