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Printers

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Shoots ionized ink at a sheet of paper in a matrix of small dots ... Solid ink is melted into the print head which spans the width of the paper ... – PowerPoint PPT presentation

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Title: Printers


1
Chapter 11
  • Printers

2
You Will Learn
  • How printers work and how to troubleshoot them

3
Printers
  • Local printers connect directly to computer via
    parallel port, serial port, USB port, infrared
    connection, wireless connection, IEEE 1394 port,
    SCSI port, or PC Card connection
  • Network printers are accessed over the network

4
Main Types of Printers
  • Laser
  • Ink-jet
  • Dot-matrix
  • Thermal printers and solid ink printers

5
Laser Printers
  • Use electrophotographic process
  • Range from small, personal desktop models to
    large network printers capable of handling and
    printing large volumes continuously
  • Require interaction of mechanical, electrical,
    and optical technologies

6
How a Laser Printer Works
  • Places toner on electrically charged rotating
    drum
  • Deposits toner on paper as paper moves through
    the system at same speed the drum is turning

7
Six Steps of Laser Printing
  • Cleaning
  • Conditioning
  • Writing
  • Developing
  • Transferring
  • Fusing
  • Take place inside toner cartridge
  • Use components that undergo the most wear

8
Six Steps of Laser Printing
9
Step 1 Cleaning
10
Step 2 Conditioning
  • Conditions drum to contain a high electrical
    charge

11
Step 3 Writing
  • Laser beam discharges a lower charge to only
    those places where toner is to go

12
Step 3 Writing
  • Data from PC is received by formatter (1) and
    passed to DC controller (2) which controls laser
    unit (3)
  • Scanning mirror (4) is turned clockwise by
    scanning motor
  • Laser beam is reflected off scanning mirror,
    focused by focusing lens (5) and sent to the
    mirror (6)
  • Mirror deflects laser beam to a slit in the
    removable cartridge and on to the drum (7)

13
Step 3 Writing
14
Step 4 Developing
  • Toner is placed onto the drum where the charge
    has been reduced

15
Step 4 Developing
16
Step 5 Transferring
  • Strong electrical charge draws toner off drum
    onto paper takes place outside the cartridge

17
Step 6 Fusing
  • Heat and pressure fuse toner to paper

18
Ink-Jet Printers
  • Small
  • Print color inexpensively
  • Tend to smudge on inexpensive paper
  • Slower than lasers

19
How an Ink-Jet Printer Works
  • Print head moves across paper, creating one line
    of text with each pass
  • Shoots ionized ink at a sheet of paper in a
    matrix of small dots
  • Several technologies are used to form ink
    droplets (eg, bubble-jet)
  • Uses ink cartridges

20
Ink-Jet Cartridges
21
Photo-Quality Ink-Jet Printers
  • New generation of ink-jet printers that give
    photo-quality results
  • Mix different colors of ink to produce a new
    color that then makes a single dot

22
Dot-Matrix Printers
  • Less expensive lesser quality
  • Impact printer can print multicopy documents
  • Print head moves across width of the paper, using
    pins to print a matrix of dots on the page
  • Uses a ribbon
  • If print head fails, buy a new printer

23
Dot-Matrix Printers
24
Thermal Printers andSolid Ink Printers
  • Relatively new printer technologies
  • Non-impact printers that use heat to produce
    printed output

25
Thermal Printers
  • Use wax-based ink that is heated by heat pins
    that melt ink onto paper
  • Internal logic of the printer determines which
    pins get heated in order to produce the printed
    image
  • Popular in retail applications for printing bar
    codes and price tags
  • Can burn dots onto special paper or use a ribbon
    that contains wax-based ink

26
Solid Ink Printers
  • Store ink in solid blocks that are easy to
    handle several can be inserted in printer to be
    used as needed
  • Solid ink is melted into the print head which
    spans the width of the paper
  • Head jets the liquid ink onto the paper as it
    passes by on a drum

27
Solid Ink Printers
  • Advantages
  • Simple design
  • Excellent print quality
  • Easy to set up and maintain
  • Disadvantage
  • Time it takes (15 minutes) for the print head to
    heat up

28
Printer Manufacturers
29
Installing a Local Printer
  • Physically attach printer to computer (via
    parallel, serial, USB, SCSI, IEEE 1394 port PC
    Card or Infrared connection or wireless access
    point)
  • Install printer drivers
  • Have Windows do it
  • Use printer manufacturers installation program
    (best way)
  • Alternately, use Windows Printer window to
    install
  • Test the printer

30
Installing a Network Printer
  • Network printer contains a NIC and connects
    directly to the network or is shared on the
    network by another PC
  • Can use Network Neighborhood or My Network Places
    to install a network printer on a remote PC

31
Troubleshooting Guidelinesfor Printers
  • Printer maintenance
  • General printer troubleshooting
  • Problems with laser printers
  • Problems with ink-jet printers
  • Problems with dot-matrix printers

32
Printer Maintenance
  • Procedures vary widely from manufacturer to
    manufacturer and printer to printer
  • Make sure consumables for the printer are on hand
  • Research printer documentation or manufacturers
    Web site for specific maintenance tips
  • Clean inside and outside of the printer

33
General Printer Troubleshooting
  • Isolate the problem
  • Application attempting to use the printer
  • OS and printer drivers
  • Connectivity between PC and printer
  • Printer itself

34
Addressing Printer Problems Caused by Hardware
  • Verify a printer self-page can print
  • Problem with printer cable

35
Problems with Laser Printers
  • Poor print quality due to low toner
  • Printer stays in warm-up mode
  • Paper Jam or Paper Out message is displayed
  • Printer images are distorted
  • Printing is slow
  • A portion of the page does not print

36
Problems with Ink-Jet Printers
  • Print quality is poor
  • Printing is intermittent or absent
  • Lines or dots are missing from the printed page
  • Ink streaks appear on the printed page

37
To Clean Ink-Jet Nozzles
38
Problems with Dot-Matrix Printers
  • Print quality is poor
  • Print head moves back and forth, but nothing
    prints

39
Chapter Summary
  • Printers and how to support them
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