Fuser failure detection
The DC controller determines a fuser unit failure, deactivates the FUSER HEATER CONTROL signal,
releases the relay to interrupt power supply to the fuser heater, and then notifies the formatter of a
failure state when it encounters the following conditions:
●
Abnormal temperature rise: The sleeve thermistor does not rise to a specified temperature
within a specified period after the fuser heater control starts.
●
Abnormally low temperature: The thermistors are at a specified temperature or lower during
a print operation or other fuser heating cycle.
●
Abnormally high temperature: The thermistors are at a specified temperature or higher,
regardless of the fuser control status.
●
Drive circuit abnormality: The frequency in the zerocross circuit is out of a specified range
when the product is turned on or is in the standby period. Or, if the current value in the fuser
heater control circuit is out of a specified range.
Fuser installation protection
The DC controller detects if the correct fuser for this product is installed by monitoring the FUSER
IMPROPER INSTALLATION (FUHL) signal during the product initial rotation (INTR) period (see
Sequence
of operation on page 3) after one of the two following conditions:
●
The product power is turned on.
●
The right door is closed.
The DC Controller notifies the formatter if it determines an incorrect fuser is installed.
Fuser presence detection
The DC controller detects if the fuser is installed by monitoring the FUSER PRESENCE (FUSEROPEN)
signal during the product initial rotation (INTR) period (see
Sequence of operation on page 3) after one
of the two following conditions:
●
The product power is turned on.
●
The right door is closed.
The DC Controller notifies the formatter if it detects that a fuser is not installed.
Fuser life detection
The DC controller detects the useful life of the fuser for the following conditions:
●
The DC controller notifies the formatter if it determines the fuser is near the end of its useful life
based on a specified number of pages printed or a specified time period passes.
●
The formatter notifies the DC Controller when a replacement fuser is installed.
ENWW
Engine-control system
17
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