1. Laser Printers Objectives
Know the Six Steps of the Laser Printing Process
Know the Components of a Laser Printer
How to Troubleshoot a Laser Printer

2. The Laser Printing Process
The physical side of the process
The electronic side of the process

3. 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

4. Six Steps of the Printing Process

5. Cleaning of the Drum This is were the printing process begins
Photosensitive drum must be physically
and electrically cleaned
Rubber Cleaning Blade
Erase Lamp

6. Charging the Drum Primary Corona wire is used Uniform Negative Voltage
600 to 1000 volts

7. Write the Image
A Laser supplies a positive charge to the drum that is the image of the print job

8. Develop 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

9. Transfer 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

10. Fusing the Image The toner is mostly composed of plastic
The paper with the image passes between two rollers
A heated roller coated with a nonstick material
A pressure roller

11. Print Job Completed Static Charge Eliminator
Printer Ejects the Printed Copy
Process begins again

12. Components of a Laser Printer
Critical Components of a laser printer are the (continued)
Transfer corona
Fuser assembly
Power supplies
Turning gears
System board
Ozone filter
Sensors and switches

13. Components of a Laser Printer
Components inside a laser printer

14. 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

15. 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

16. Troubleshooting a Laser Printer
Maintenance
Problems

17. Maintenance
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

18. Maintenance
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

19. Problems
A user can encounter the following problems when working with laser printers:
Blank paper
Dirty print outs
Ghosting
Vertical white Lines

20. Problems
Blotchy print
Spotty print

21. Troubleshooting 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

22. Components of a Laser Printer
The critical components of a Laser Printer are the:
Toner Cartridge
Photosensitive drum
Erase Lamp
Primary Corona
Laser
Toner