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20 July 2005
6.3.2 TRANSFER UNIT
A PTL (Pre-transfer Lamp) and a transfer roller move toner from the OPC drum
onto the paper. The PTL shines light onto the OPC. This reduces the electrical
charge on the surface of the OPC drum and improves the transfer efficiency. The
transfer roller moves toner from the OPC drum to the paper.
6.3.3 DRIVE
The main PWA supplies power to the paper drive assembly. The main motor
supplies power to the following.
• Paper feed unit
• Toner cartridge
• Fusing unit
• Pick-up, feed and exit rollers.
6.3.4 FUSING UNIT
The fusing unit consists of the following.
• Fusing lamp
• Hot roller
• Pressure roller
• Thermistor and thermostat.
The fusing unit uses pressure and heat to melt toner to the paper.
Thermostat
The thermostat cuts off the power to the fusing lamp to not let the machine
overheat. Power gets cut when the thermostat temperature gets to 160 C.
Thermistor
The thermistor detects the surface temperature of the hot roller. This information
goes to the main processor which uses this information to regulate the temperature
of the hot roller.
Hot Roller
The fusing lamp heats the surface of the hot roller. Toner gets melted and stays on
the surface of the paper when the paper passes between the hot roller and
pressure roller. The surface of the hot roller is coated with Teflon to ensure that
toner does not stay on the roller surface.
Pressure Roller
The pressure roller is mounted under the hot roller. It is made of a silicon resin, and
the surface of the roller is coated with Teflon. This ensures that toner does not stay
on the roller surface.
6-9
SYSTEM LAYOUT
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