Laser printer - Rich in speed, quality, resolution.

WHAT IS A LASER PRINTER?

A laser printer is a popular type of personal computer printer that uses a non-impact (keys don't strike the paper), photocopier technology. When a document is sent to the printer, a laser beam "draws" the document on a selenium-coated drum using electrical charges. After the drum is charged, it is rolled in toner, a dry powder type of ink. The toner adheres to the charged image on the drum. The toner is transferred onto a piece of paper and fused to the paper with heat and pressure. After the document is printed, the electrical charge is removed from the drum and the excess toner is collected. Most laser printers print only in monochrome. 

FEATURES TO CONSIDER WHEN BUYING A LASER PRINTER 

1. QUALITY

Laser printers have always been preferred by businesses. They are known for their good print quality without having any fuzzy edges on the lettering. Some laser printers are now capable of color, and so they are finding a place in more homes. Laser printers don't require special paper to get great color detail and print at a higher resolution. 

2. SPEED 

Laser printers print the entire page as it is fed through the printer. Only one pass is needed so the print is completed much quicker. Laser printers are very fast in terms of printing.

3. PRINT CAPACITY AND SPEED 

Personal laser printers are sufficient for printing an average of 200 pages per week. They can print up to eight ppm (pages per minute). A workgroup printer is needed if an average of 1000 pages per week is needed. These print up to 24 ppm and more. Production printers are needed for printing 50,000 or more pages per week. These are quite expensive and are used by commercial publishers. They can print up to 700 ppm and up. They can print 24 hours a day, seven days a week.

4. RESOLUTION

The standard resolution in most laser printers today is 600 dots-per-inch ( dpi ). This resolution is sufficient for normal everyday printing including small desktop publishing jobs. A high-end production printer might have a resolution of 2400 dpi. 

5. PRINTER LANGUAGES 

Printer Control Language ( PCL ) is the standard printer language. PCL is used for printing letters, database printouts, spreadsheets, and simple graphics. Postscript printers are used with desktop publishing software and drawing packages. A laser printer that uses PCL can be upgraded to Postscript by installing a software driver provided by the manufacturer of the laser printer. The printer might require more memory when upgraded to use Postscript. This is because a laser printer needs the entire image in memory before printing, and a Postscript printer requires more memory to process than a PCL printer does. The application being used must support Postscript in order for the laser printer to print Postscript documents.

6. PAPER HANDLING 

Paper handling is important when shopping for a laser printer. Most laser printers use letter-size, cut-sheet paper. High-end production printers use continuous sheet paper. Laser printers can print on transparencies, adhesive labels, and lightweight cards. A laser printer with duplex printing can print on one side of the paper, turn the paper over, and print on the other side. Most laser printers, however, use simple printing with manual duplex printing. Manual duplex printing is achieved by changing the print options in the printer's properties or printing one side and taking that same paper and reinserting it into the printer to print on the other side.

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