2-2 Phaser 3250 Laser Printer Service Manual
Theory of Operation
Phaser 3250 Operational Overview
The Phaser 3250 is a monochrome laser printer that uses Laser Scanner Unit
(LSU) with an electrophotographic process. The printer system consists of
one print cartridge which creates toner image.
System Overview
The Phaser 3250 Laser Printer consists of the Feeding Mechanism, Drive
Assembly, Transfer Roller, Fuser, Laser Unit, Control Panel, and Printer
Controller.
■ Feeding Mechanism: The Feeding mechanism consists of the Manual
Feeder, Tray 1, Tray 2, Pick-Up Roller, Tray Holder Pad, and Feed Rollers.
The rollers and sensors in the paper feed path control paper registration
and guide the paper through the image transfer, image development,
image fusing, and exit assemblies.
■ Drive Assembly: The Drive Assembly receives power from the Main
Controller Board, The Main Motor provides drive energy to the paper feed,
Toner Cartridge, Fuser, Pick-Up Roller, Feed Rollers, and Duplex Unit.
The Drive Assembly consists of a Main Motor.
■ Main Motor: DC 24V
■ Rated RPM: 2170 rpm
■ Transfer Roller: The Transfer Roller transfers toner on an Organic Photo
Conductor (OPC) to the paper.
■ Fuser: The Fuser consists of a Heat Lamp, Heat Roller, Pressure Roller,
Thermistor, and Thermostat. The Fuser applies toner on to paper using
heat and pressure.
■ Laser Unit: The Laser Unit is an exposure unit that generates laser
beams to form electrostatic latent image on the drum surface.
■ Control Panel: The Control Panel displays LED status of the printer.
■ Printer Controller: The Printer Controller controls the total system of the
machine. The Printer Controller processes and stores images from the
Print Engine, printer I/F, and controls the panel.