NOTE: When the thermoswitches reach this temperature, the actual temperature on the fuser
rollers is approximately 370° C (698° F).
Table 1-14 Fuser control functions
Function Supported feature
Fuser temperature control Yes
Fuser failure detection Yes
Frequency detection circuit failure detection Yes
Fuser depressurization mechanism failure detection Yes
Fuser type discrepancy detection Yes
Fuser type identification detection Yes
Fuser presence detection Yes
Fuser life detection Yes
Relay failure detection Yes
Pressure roller cleaning Yes
Fuser edge cooling function Yes
The conditions of the fuser failure detection change as follows:
●
Abnormal high temperature
◦
Abnormal high temperature 1
The sub thermistor 1 keeps detecting 285°C (545°F) or higher for a specified period.
◦
Abnormal high temperature 2
The sub thermistor 2 keeps detecting 285°C (545°F) or higher for a specified period.
The sub thermistor 3 keeps detecting 285°C (545°F) or higher for a specified period.
◦
Abnormal high temperature 3
The main thermistor keeps detecting 210°C (410°F) or higher for a specified period.
●
Abnormal low temperature
◦
Abnormal low temperature 1
The sub thermistor 1 keeps detecting 80°C (176°F) or lower for a specified period during
INTR period or PRINT period.
24 Chapter 1 Theory of operation ENWW
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