HAKUBA 26PPM Laser Printer - Base Engine Technical Manual
13-31
Version 1.0
Principles of Operation
Fuser Assy
Uses heat and pressure to permanently fix the toner image onto a sheet
of paper.
The Fuser Assy is made up of nine major components
Heat Rod:
An electric coil that is sealed inside a glass tube. The Heat
Rod is located inside the Heat Roll and provides the heat necessary to
melt the toner image onto a sheet of paper.
Temperature Sensor:
Monitors the Heat Roll surface temperature,
switching the Heat Rod on or off to maintain the proper temperature
range. The Temperature Sensor is a temperature sensitive resistor that
rides the Heat Roll surface. The Temperature Sensor functions as the
first–stage, fuser–overheat protection.
Heat Roll:
A hollow, surface-coated metal tube that is heated by the Heat
Rod, and in turn applies heat to a sheet of paper in order to melt the toner.
The negative charge that builds up on the Heat Roll is shunted through a
diode to frame ground.
Pressure Roll:
A solid, rubber-coated metal shaft that presses the sheet
of paper between itself and the Heat Roll. This bonds the toner to the
paper.
Fuser Thermostat:
Connected in series with the Heat Rod power supply,
the Thermostat functions as the second-stage, fuser–overheat preven-
tion. If the first stage fails to prevent a fuser overheat, the Thermostat
opens the circuit between the Heat Rod and the power supply.
Fuse:
Connected in series with the Heat Rod power supply, the Fuse
functions as the third–stage, fuser over–heat prevention. If the both first
and the second stages fail to prevent a fuser overheat, the fuse opens the
circuit between the Heat Rod and the power supply.
Sensor Exit:
Monitors when a sheet of paper passes the paper outlet.
The sensor is ON when paper actuates the Actuator Exit of the Sensor
Exit.
ActuatorExit/Sensor Exit:
Monitors when a sheet of paper passes the
paper outlet.
Summary of Contents for b 6100
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