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Service Guide OF1000
Chapter 2 Principles of Operation
2.4.05 Fuser Unit
The fuser unit is controlled by a thermistor, the printer interface gate array, an LSI and the CPU to
keep the heat roller surface temperature within a predetermined range (about 150 degrees
Celsius). A thermal fuse within the fuser unit prevents abnormal temperature rises in case the
thermistor fails.
NOTE:
The CPU checks for an open circuit in the thermistor at power -on, setting a fuser alarm if this
error is detected.
The CPU also sets a fuser alarm if the proper temperature is not attained within a specified period
of time after power-on.
Upon detecting a fuser alarm, the CPU will halt (after printing the current page).
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Summary of Contents for OF1000
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