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Low-voltage power supply
Fixing control circuit
+24V
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).
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).
When the Fixing Heater safety circuit detects a temperature above a certain temperature, it shuts down the power supply to
the Fixing Assembly.
3. Thermoswitch
When the temperature of the Fixing Heater rises abnormally and the Thermoswitch (TP1) exceeds a certain temperature,
the contact of the Thermoswitch is disconnected to shut down the power supply to the Fixing Assembly.
Fixing heater
control circuit
Relay
control
circuit
RL101
Fixing heater
safety circuit
Frequency
FREQSNS
detection circuit
FSRD
RLYD
FSRTH
Fixing film unit
TH1
TP1
Pressure roller
TP1: Thermoswitch
TH1: Thermistor
34
2. Technical Explanation (Device)
DC controller
H1: Fixing heater
Fixing unit
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Troubleshooting
