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5016-001
Fuser/Paper Exit Unit
Operation of the fuser and paper exit
When the power switch is turned on the fuser lamp is turned on by
the low voltage power supply while the hot roll begins to heat.
When the hot roll reaches approximately 170 degrees C the fuser
drive motor is turns on and the backup roll, hot roll and paper exit
rollers start turning. After a specified time the fuser drive motor turns
off and the printer is ready to print.
The thermistor continuously detects the temperature of the surface
of the hot roll, turning the fuser lamp on and off keeping the surface
of the hot roll at a specified temperature.
After the last sheet of paper prints and the paper exit sensor detects
the exit of the sheet of paper, the fuser drive motor turns off and the
backup roll, hot roll and paper exit roll stop turning.
A thermostat is provided to protect the fuser unit should an unusual
rise in temperature occur in the hot roll assembly. If activated, the
thermostat shuts off power to the fuser lamp.
A cleaner unit is located on top of the hot roll. The oil roller in the
cleaner unit supplies a specified amount of oil to the hot roll
preventing an offset. The cleaning roller prevents the hot roll from
becoming dirty from a buildup of toner or paper dust.
If power is applied to the fuser unit and a cleaner unit has not been
installed, the paper exit sensor lever is detached from the paper exit
sensor and the printer proceeds to the paper jam state, preventing
the hot roll, backup roll and paper exit roller from rotating.