2-2 Phaser 3250 Laser Printer Service ManualTheory of OperationPhaser 3250 Operational OverviewThe Phaser 3250 is a monochrome laser printer that uses Laser Scanner Unit(LSU) with an electrophotographic process. The printer system consists ofone print cartridge which creates toner image.System OverviewThe Phaser 3250 Laser Printer consists of the Feeding Mechanism, DriveAssembly, Transfer Roller, Fuser, Laser Unit, Control Panel, and PrinterController.■ Feeding Mechanism: The Feeding mechanism consists of the ManualFeeder, Tray 1, Tray 2, Pick-Up Roller, Tray Holder Pad, and Feed Rollers.The rollers and sensors in the paper feed path control paper registrationand guide the paper through the image transfer, image development,image fusing, and exit assemblies.■ Drive Assembly: The Drive Assembly receives power from the MainController 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 PhotoConductor (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 usingheat and pressure.■ Laser Unit: The Laser Unit is an exposure unit that generates laserbeams 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 themachine. The Printer Controller processes and stores images from thePrint Engine, printer I/F, and controls the panel.
