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.
●
Start-up failure conditions
◦
The main thermistor temperature does not reach 50°C (122°F) within a specified period of heater
startup during the wait period.
◦
The main thermistor temperature does not reach the targeted temperature within a specified
period after the temperature once reaches 50°C (122°F) from the heater startup during the wait
period.
◦
The main thermistor temperature does not reach the targeted temperature within a specified
period under the heater temperature control during the initial rotation period.
●
Abnormal low temperature conditions
◦
The main thermistor temperature remains at 100°C (212°F) or lower for a specified period under
the heater temperature control during the print period.
●
Abnormal high temperature conditions
◦
The main thermistor temperature remains at 235°C (487°F) or higher for a specified period.
◦
The temperature of either one of the sub thermistors remains at 273°C (523°F) or higher for a
specified period.
●
Fuser heater drive circuit failure
◦
The specified count of the zero crossing signal is not detected within a specified period after the
product is turned on.
◦
The frequency is out of the specified range (40 to 70 Hz).
ENWW Engine control system 13
To Next Page
Loading...