For the A+ exam, you must have an understanding of the Laser Printing Process. Here is an explanation of the same by forum member JamesUK
The Laser Printing Process
This is a comprehensive guide to A+ favourite printer, the laser.
The following is a list of each stage of the laser printing process. Followed by a description of what each process does.
Cleaning - The Rubber Blade removes any excess toner which drops into the debris cavity. The eraser lamp that removes any excess charge off the photosensitive drum. This leaves the drum with a charge of
0 VoltsConditioning - The primary cornea (High Voltage Wire) adds a negative charge of around
-600 volts to - 1000 voltsWriting - The laser light hits the photosensitive drum, where the light hits the drum it dissapates the negative charge to the centre of the drum which is grounded. This then leaves sections of the drum with a voltage of
-100 voltsDeveloping - The drum rolls through a supply of negativly charged toner particles (Particles are
-200 Volts to -500 Volts)
Where the drum hasnt been touched by the laser light a lower negative charge is still there, so the particles are not attracted to this section of the photosensitive drum.
Transfer - A strong positive charge is applied the the paper, the particles of toner are attracted to the paper.
Fusing - The toner that is on the paper is heated and pressurised, the toner becomes bonded to the paper.
You do have to remember the voltages.
. The thread also contains an alternate explanation of the process by forum member
. Spy is a senior forum member. If you are regular with the forum you would have come across many other helpful posts by Spy.
Feel free to share your tips or comments on laser printing either here or on the
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stephian1, Jul 14 2007, 03:55 AM
