Laser PrintersObjectives

Laser PrintersObjectives

Know the Six Steps of the Laser Printing Process

Know the Components of a Laser Printer

How to Troubleshoot a Laser Printer

The Laser Printing ProcessThe Laser Printing Process

The physical side of the process The electronic side of the process

The Physical Side of the Laser Printing Process

The Physical Side of the Laser Printing Process

Laser printers perform the printing process in a series of steps

Cleaning the drum Charging (conditioning) the drum Writing the image to the drum Developing the image Transferring the image Fusing the image

Six Steps of the Printing Process

Six Steps of the Printing Process

Cleaning of the DrumCleaning of the Drum

This is were the printing process begins Photosensitive drum must be physically

and electrically cleaned Rubber Cleaning Blade Erase Lamp

Charging the DrumCharging the Drum

Primary Corona wire is used Uniform Negative Voltage 600 to 1000 volts

Write the ImageWrite the Image A Laser supplies a positive charge to

the drum that is the image of the print job

Develop the ImageDevelop the Image

The toner particles are negatively

charged and are attracted to the positive

charged areas on the drum This creates the print image on the

drum

Transfer the ImageTransfer the Image

The image now must be transferred from the drum onto the paper

The transfer corona puts a positive charge on the paper

The negatively charged toner particles are transferred to the paper

Fusing the ImageFusing the Image The toner is mostly composed of plastic The paper with the image passes

between two rollersA heated roller coated with a nonstick material

A pressure roller

Print Job CompletedPrint Job Completed

Static Charge Eliminator Printer Ejects the Printed Copy Process begins again

Components of a Laser PrinterComponents of a Laser Printer

Critical Components of a laser printer are the (continued)

Transfer coronaFuser assemblyPower supplies Turning gearsSystem boardOzone filterSensors and switches

Components of a Laser PrinterComponents of a Laser Printer

Components inside a laser printer

The Electronic Side of the Laser Printing Process

The Electronic Side of the Laser Printing Process

A raster image is a pattern of dots Laser printers use a laser to “paint” a

raster image on the photosensitive drum It uses a chip called the Raster Image

Processor (RIP) to translate the raster image sent to the printer into commands to the laser

The Electronic Side of the Laser Printing Process

The Electronic Side of the Laser Printing Process

The RIP needs memory (RAM) in order to store the data that it must process

A laser printer must have enough memory to process an entire page

Troubleshooting a Laser PrinterTroubleshooting a Laser Printer

Laser printerMaintenance

Problems

MaintenanceMaintenance

The rubber guide rollers of the laser printer can be cleaned with a small amount of alcohol on a fibrous cleaning towel

Printer maintenance kits help to assure the continuing reliability of LaserJet printers

MaintenanceMaintenance

Replacing certain components of the laser printer periodically ensures a long, healthy life for the printer

Following the manufacturer’s maintenance guidelines also helps to ensure years of trouble-free, dependable printing from the laser printer

ProblemsProblems

A user can encounter the following problems when working with laser printers:

Blank paperDirty print outsGhostingVertical white Lines

ProblemsProblems

Blotchy print Spotty print

Troubleshooting a Laser PrinterTroubleshooting a Laser Printer

General troubleshooting issues that crop up with laser printer are:

Print jobs never print Print job that comes out in a strange size Misaligned or garbage printouts Problems sharing multiple printers Consumables and crashes on power up

Components of a Laser PrinterComponents of a Laser Printer

The critical components of a Laser Printer are the:

Toner CartridgePhotosensitive drum Erase Lamp Primary Corona LaserToner