laser printers objectives know the six steps of the laser printing process know the components of...
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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
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The Laser Printing ProcessThe Laser Printing Process
The physical side of the process The electronic side of the process
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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
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Six Steps of the Printing Process
Six Steps of the Printing Process
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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
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Charging the DrumCharging the Drum
Primary Corona wire is used Uniform Negative Voltage 600 to 1000 volts
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Write the ImageWrite the Image A Laser supplies a positive charge to
the drum that is the image of the print job
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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
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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
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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
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Print Job CompletedPrint Job Completed
Static Charge Eliminator Printer Ejects the Printed Copy Process begins again
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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
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Components of a Laser PrinterComponents of a Laser Printer
Components inside a laser printer
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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
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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
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Troubleshooting a Laser PrinterTroubleshooting a Laser Printer
Laser printerMaintenance
Problems
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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
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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
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ProblemsProblems
A user can encounter the following problems when working with laser printers:
Blank paperDirty print outsGhostingVertical white Lines
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ProblemsProblems
Blotchy print Spotty print
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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
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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