HP Color LaserJet Professional CP5220 Service Manual - Page 29
Fuser failure detection
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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 notifies the formatter of a failure state when it encounters the following conditions: ● Abnormal temperature rise: The sleeve thermistor does not rise at 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. ENWW Engine-control system 17