Protective Functions; Protection Function - Canon LBP351 Series Service Manual

M299 Fixing motor
Fixing pressure
release cam
Fixing pressure release sensor
Execution condition/timing of disengagement operation:
• At occurrence of a jam
• Default status
If disengagement operation is not performed although a specified period of time has passed, an error code is notified.
<Related error codes>
E840-0000: Fixing disengagement error

■ Protective Functions

● Protection Function
The Protection Circuit shuts down the power supply to the Fixing Heater if the Fixing Assembly detects abnormal temperature
rising.
The following three methods are used to perform detection to prevent abnormal temperature rising.
• DC Controller
• Fixing Heater safety circuit
• Thermoswitch
The following explains each of the functions.
1. DC Controller
The DC Controller monitors the detected temperatures of the Main Thermistor (TH1) and Sub Thermistor (TH2).
The DC Controller stops the fixing drive and shuts down the power supply when a thermistor exceeds a certain temperature.
2. Fixing Heater safety circuit
The Fixing Heater safety circuit detects the temperature of the Main Thermistor (TH1) and Sub Thermistor (TH2).
When the Fixing Heater safety circuit detects a temperature above a certain temperature, it shuts down the power supply to
the Fixing Assembly.
DC controller
PS699
Pressure roller
<Pressurized>
Fixing sleeve
34
2. Technical Explanation (Device)
<Released>