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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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  • 1. Printer
  • 2. 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.
  • 3. 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
  • 4. 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
  • 5. Daisy Wheel Printer
  • 6. Dot Matrix Printer (DMP)
  • 7. 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]
  • 8. 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
  • 9. 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
  • 10. DMP
  • 11. 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
  • 12. 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
  • 13. 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.
  • 14. DMP
    • Carriage motor is basically a stepper motor.
    • Carriage motor provides the actual force to move the carriage
  • 15. 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)
  • 16. Ink jet printer
  • 17.
    • 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.
  • 18. 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
  • 19. 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
  • 20. Laser printer
  • 21. 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.
  • 22. 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
  • 23. Printer
  • 24.
    • THE END