Exit (Pl7) - Oki B6100 Technical Manual

Fuser Assy
OKI B6100 Laser Printer - Base Engine Technical Manual
Version 1.0
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.
Principles of Operation
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