Led Heads; Fuser - Xerox Phaser 7400 Service Manual

LED Heads

The LED Heads receive signals from the Engine Control Board and scan the surface
of the four Imaging Unit drums to create a latent image. The resolution is either
600 dpi or 1200 dpi and is determined by the customer setting.

Fuser

The Fuser, using a combination of heat and pressure, bonds the toner to the paper. The
Fuser is replaced as a unit. The Heat Roller is heated by two internal halogen lamps,
and the Pressure Roller is heated by a separate lamp. The Pressure Roller puts
pressure against Fuser Belt, media, and Heat Roller to melt the toner and bond the
image to the paper. After the toner image is fused to the paper, the paper passes
through the Fuser Exit Sensor indicating the sheet's progress. To better understand
Fuser errors, Fuser components are described in the following table.
Fuser Components
Component
Heat Roller
Pressure Roller
Heater Lamps
2-4
LED Holders
Function
The Heat Roller is a metal tube with a coated surface and a
Heater Assembly inside. As paper passes between the Heat
Roller and Pressure Roller, the heat fuses the toner to the paper.
The Pressure Roller is a metal shaft coated with sponge rubber.
The Pressure Roller maintains pressure on the paper passing
between it and the Heat Roller. This pressure bonds the melted
toner to the paper.
The Heater Lamps are quartz glass tubes containing heater
coils. The Heater Lamps heat the Heat Roller.
Light Cover
LED Head
Phaser 7400 Color Printer Service Manual
s7400-385