●
Thermistor open: The DC controller determines a thermistor open if:
◦
The detected temperature of TH1 is kept at 12° C (53° F) or lower for a specified time after
the fuser (fixing) motor is turned on.
◦
The detected temperature of TH2 is kept at 4° C (39° F) or lower for a specified time.
◦
The detected temperature of TH3 is kept at 4° C (39° F) or lower for a specified time.
●
Drive-circuit failure: The DC controller determines a drive-circuit failure:
◦
If the detected power supply frequency is out of a specified range when the printer is turned
on or during the standby period
◦
If the current detection circuit detects an out of specified current value
●
Fuser (fixing) discrepancy: The DC controller determines a fuser type mismatch when it
detects an unexpected fuser (fixing) unit presence signal. The product has two fusers for 110 V or
220 V input power.
22 Chapter 1 Theory of operation ENWW
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