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This is basic Knowledge about Printer and its types and technology.

This is basic Knowledge about Printer and its types and technology.

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    Printer Printer Presentation Transcript

    • Printer
    • Printer
      • Printer is one of the most important peripheral component of the computer.
      • The printers are evaluated on the basis of the following factors:
      • - Printer Resolution:- It is measured in dots per inch(dpi). It indicates the number of vertical and horizontal dots that can be printed. Higher the resolution better is the quality.
    • Printer( con…)
      • Speed : It is the number of pages printed per minute
      • Paper Capacity: The number of pages that can be accommodated in the paper tray. The different sizes of pages that can be printed by the printer
      • Cost of Paper: It indicates the cost of any special paper
    • Classification of Printer
      • In general Printers can be classified in two broad categories
      • - IMPACT TYPE PRINTERS
      • In this type, physical force is applied to get an impression of the character.
      • E.g. DAISY-WHEEL printers, DOT-MATRIX printers,
      • - NON-IMPACT TYPE PRINTERS
      • In this type, physical force is NOT applied to get an impression of character; instead either the IMAGE is transferred to paper electro statically or ink is sprayed on to paper to form the character .
      • E.g. INK-JET printers, LASER printers
    • Daisy Wheel Printer
    • Dot Matrix Printer (DMP)
    • DMP
      • Dot-Matrix printers strike the page with small rods (called needles) that protrude from the print head
      • DMPs can be characterized by following 5 parameters.
      • - No of pins in print head.
      • - Characters per second (CPS)
      • - Characters per inch (CPI)
      • - Interface used [parallel / serial]
    • DMP( pin, char/s, char/inch )
      • No of pins in print head.
      • • 9 pins
      • • 24 pins
      • Characters per second (CPS)
      • 240 char/s
      • Characters per inch (CPI)
      • 10 cpi, 12 cpi or 15 cpi. 15 cpi mode or 17 cpi is called as condensed mode .
      • new printers 20 cpi is also possible
    • DMP( interface )
      • Two types of interfaces used to communicate with computer.
      • - Parallel
      • - Serial
      • For parallel interface, we use a standard 36 pin centronics interface.
      • This interface has
      • - 25 pin D type female connector to the computer side
      • - 36 pin Amphenol type connector to printer side
    • DMP
    • DMP
      • Two types of print heads
      • -With cable
      • -Without cable.
      • With cable
      • The head cable is directly soldered to the print head
      • If the cable becomes faulty you have to throw the complete head.
      • Hence, it is not preferable.
      • e.g. TVSE series except LSP100
    • DMP
      • Without cable
      • The head cable is connected to head through a connector.
      • If the cable is gone faulty, then it can be easily replaced.
      • Hence, it is preferred.
      • eg. EPSON series except FX105 MX80
    • DMP
      • This provides the movement for the print head.
      • It is having a base for head & two rails.
      • Over these rails the base or ‘carriage’ moves horizontally from left to right & back.
    • DMP
      • Carriage motor is basically a stepper motor.
      • Carriage motor provides the actual force to move the carriage
    • Ink jet printer
      • The ink tiny droplets of ink onto the paper
      • Its available in black and white and color printer
      • 300 dpi, 16 pages per minute (PPM)
    • Ink jet printer
      • The most popular way of connecting a printer to a computer is through the parallel port (LPT)
      • Universal Serial Bus (USB) port.
      • small computer system interface (SCSI) port.
    • Ink jet Printer
      • 512 KB random access memory (RAM) to 16 MB RAM, depending on the model.
      • If the trigger is not depressed, the printer lights up the "Out of Paper" LED and sends an alert to the computer
    • Laser Printer
      • 1200 dots per inch
      • 17-19 pages per minute for text and 6 to 7 pages per minute for graphics.
      • ~600 and ~1,000 volts.
      • Toner (~200 and ~500 volts)
      • Process
      • 1.Clean 4.Develop
      • 2.Charge 5.Transfer
      • 3.Write 6.Fuse
    • Laser printer
    • Laser process
        • 1. Cleaning: Excess toner is scraped from the photoelectric drum.
        • 2. Conditioning : A uniform -600 volt charge is placed on the photoelectric drum by the primary corona.
        • 3. Writing: Laser diodes write an invisible electric image on the photoelectric drum by causing the drum surface to be less negative wherever the laser beam hits.
    • Laser process
        • 4. Developing : This is where the transfer roller places the toner on the drum. The toner sticks to the areas that have had the electric charge lessened due to the laser beam.
        • 5 . Transfer : The secondary corona uses a positive charge to attract the toner from the drum to the paper. The Paper gets charged by corona too.
        • 6. Fusing : The toner is then melted into the paper
    • Printer
      • THE END