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Thread: All About Lasers

  1. #1

    All About Lasers

    Ok, this tutorial will be a short one on how the laser printer works. Now

    i am a bit rusty because of the fact that I haven't studied these in a

    long while, but wanted to write a tutorial and this came to mind. I will

    basically just go over the order of events (ie what happens from start to

    finish during a regular print job, as that is important in understanding

    how the laser printer works.)

    Ok first off, the laser printer has to "Charge" as in, get its stuff

    warmed up. It uses the high-voltage power supply (HVPS) to conduct

    electricity to its primary corona wire. Which then passes the voltage to

    "Drum" I wont go over the specific parts such as what the drum actually

    does, etc because if you are reading this, you should already have an

    understanding of the components of the laser printer. Typically, the

    voltage used in the first step is around -5000vDC (volts of direct


    The second step is referred to as "Writing" the photosensitive drum with

    its newly charged voltage, as per the first step, now has a very high

    negative charge. The laser of the printer begins to move back and forth,

    so to speak, along the drum, creating the image that will be on the

    output. ie paper. Because this drum is photosensitive, the laser uses

    charge each time it touches something. (Toner, drum, whatever) By the

    end of the printers writing, the image is now around -100vDC. The drum

    however, retains most of its charge, if not all.

    The third step is known as developing. The toner cartridge is now opened

    up. The toner becomes attracted and is able to be used. By the end of this

    stage, the drum contains a toner covered image. and the drum retains most

    of its charge, yet again.

    The fourth step, known as transferring, is where the paper begins to come

    through the printer, and past the drum. The transfer corona wire is what

    applies the positive charge to the paper as it moves through. This charge

    pulls negative charged toner from the drum out onto the paper.

    The fifth step, known as Fusing, is the only thing holding the toner to

    the paper as the electric charges. The toner melts its resin, when heated,

    and the paper leaves the printer through fusing rollers, which are

    previously heated by the fusing lamp. The heat on the rollers then melts

    or fuses, to the paper.

    Cleaning is the final step, this is when the printout completes, of

    course. A rubber cleaning blade goes across the drum to remove the

    extra toner that wasn't used from the drum. The toner is then moved over

    to a small place for it to remain for later use. Next, erasure lamps

    move across exposing the drum to the light. Again remember that the

    drum is photosenstive, and loses remaining charge when light hits it

    The printer is now returned to its previous pre-print state, and is ready

    to go for more.

    I recommend a good HP-Laserjet printer, or something of the like. I do not

    own one personally, but have used them extensiveley in class and at other

    places. Hope you liked the short tutorial, you can find some of the

    keywords used at places like google.com, tech-target definitions, etc..

    Any questions or comments email er0k@bytekill.net

    like i said, its been a while so this off of my head may be inaccurate,

    especially the charges, but maybe not..

  2. #2
    Senior Member
    Join Date
    Oct 2001
    hahahahha ****in printers w000t 31337

  3. #3
    hahahahah yerp, i was bored, so i through that together for something to do

  4. #4
    Senior Member
    Join Date
    Oct 2001
    heh just unexpected. gj though.

    you could at leasy explained the old paper cut vulrability or paper burn :P


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