Printer cables
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Printer cables PowerPoint PPT Presentation


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Printer cables. Maximum length for parallel cable is 15 feet. (some say 10) 25-pin DB male connector on cable connects to DB female connector on motherboard 36-pin Centronics connector on printer end of connecting cable . LPT Ports. Parts of a laser printer.

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Printer cables

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Printer cables

  • Maximum length for parallel cable is 15 feet. (some say 10)

  • 25-pin DB male connector on cable connects to DB female connector on motherboard

  • 36-pin Centronics connector on printer end of connecting cable


LPT Ports


Parts of a laser printer

  • Photosensitive drum- reacts to light

    • holds a charge except where it is exposed to light

  • Paper transport- 4 types of rollers that move paper through printer

    • This is where most paper jams occur!

  • Primary corona- main corona

    • located inside toner cartridge

    • uniformly charges drum to -600V


Parts cont.

  • Transfer corona- transfers image from drum to paper

    • transfer corona charges the paper

    • the charged paper pulls toner from drum to paper

  • Fusing roller- permanently melts toner to page

    • this is why laser printer pages are hot

  • Controller- includes printer RAM

  • Power supply- high-voltage AC and DC


Steps in laser printing

  • Cleaning

    • Before page is printed, remnants of previous print are swept away

    • Rubber blade sweeps left-over toner away

    • Fluorescent lamp removes any remaining electrical charge on drum

  • Conditioning

    • The primary corona (AKA main corona) wire uniformly charges drum to -600V


Steps cont.

  • Writing

    • image of page is created on drum

    • where laser beam contacts drum, the charge is reduced to -100V from -600V

    • the controller loads sheet of paper to the registration roller of the paper transport system

  • Developing

    • Creating print image on drum

    • the iron particles in toner cartridge are attracted to the areas of drum exposed by laser


Steps cont.

  • Transferring

    • image transferred to paper

    • sheet of paper at registration roller is given a positive charge

    • negatively charged toner on drum is attracted onto positively charged paper

  • Fusing

    • fusing rollers apply heat and pressure to toner

    • toner melts and permanently bonds to paper


1. Cleaning

2. Conditioning

3. Writing

4. Developing

5. Transferring

6. Fusing

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Fandango!

Remember…steps of laser print


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