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Chapter 21. Supporting Printers. You Will Learn…. How printers work How to install printers and share them over a local area network How to troubleshoot printer problems. Main Types of Printers for Desktop Computing. Laser Ink-jet Dot-matrix. Laser Printers.

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chapter 21

Chapter 21

Supporting Printers

you will learn
You Will Learn…
  • How printers work
  • How to install printers and share them over a local area network
  • How to troubleshoot printer problems
laser printers
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
how a laser printer works
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
six steps of laser printing






Take place inside toner cartridge

Use components that undergo the most wear

Six Steps of Laser Printing
step 2 conditioning
Step 2: Conditioning
  • Conditions drum to contain a high electrical charge
step 3 writing
Step 3: Writing
  • Laser beam discharges a lower charge to only those places where toner is to go
step 3 writing11
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)
step 4 developing
Step 4: Developing
  • Toner is placed onto the drum where the charge has been reduced
step 5 transferring
Step 5: Transferring
  • Strong electrical charge draws toner off drum onto paper; takes place outside the cartridge
step 6 fusing
Step 6: Fusing
  • Heat and pressure fuse toner to paper
ink jet printers
Ink-Jet Printers
  • Small
  • Print color inexpensively
  • Tend to smudge on inexpensive paper
  • Slower than lasers
  • Quality of paper significantly affects quality of printed output; use high-grade paper designed for an ink-jet printer
how an ink jet printer works
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; best to use two separate cartridges – one for black ink and one for three-color printing
dot matrix printers
Dot Matrix Printers
  • Less expensive; lesser quality
  • Impact printer; can print multicopy documents
  • Print head moves across width of paper, using pins to print a matrix of dots on the page
  • Uses a ribbon
  • If print head fails, more economical to buy a new printer than to replace the print head
how windows handles print jobs
How WindowsHandles Print Jobs
  • Uses spooling
  • For Windows 9x or Windows NT/2000/XP using a PostScript printer
    • Print job data is converted to PostScript language
  • For Windows 9x applications using a non-PostScript printer
    • Print job data is converted to Enhanced Metafile Format (EMF)


how windows handles print jobs24
How WindowsHandles Print Jobs
  • For Windows 2000/XP
    • A printer language that competes with PostScript is PCL (Printer Control Language)
  • Text data that contains no embedded control characters is sent to the printer as is
installing and sharing a printer
Installing and Sharing a Printer
  • Local printer
    • Connects to computer by way of a port on the computer
  • Network printer
    • Accessed by way of a network
  • Default printer
    • The printer Windows prints to unless another is selected
install a local printer
Install a Local Printer
  • Physically attach printer to computer (via parallel, serial, 1394, or USB port, or wireless access point)
  • Install printer drivers
    • Use Windows Printer window
    • Use printer manufacturer’s installation program (best way)
  • Test the printer
sharing a printer with others in a workgroup
Sharing a Printer with Others in a Workgroup
  • To share a local printer, File and Printer Sharing must be installed
  • To use a shared printer on a remote PC, Client for Microsoft Networks must be installed
using a shared printer
Using a Shared Printer
  • Two approaches to installing shared network printer drivers on a remote PC
    • Use the drivers on CD (either Windows CD or printer manufacturer’s CD)
    • Use printer drivers on host PC (quicker)
other methods of sharing printers over a network
Other Methods of Sharing Printers over a Network
  • A regular printer can be attached to a PC using a port on the PC, and then that PC can share the printer with the network
  • A network printer with embedded logic to manage network communication can be connected directly to a network with its own NIC
  • A dedicated device or computer called a print server can control several printers connected to a network
troubleshooting guidelines for printers
Troubleshooting Guidelines for Printers
  • Routine printer maintenance
  • General printer troubleshooting
  • Problems with laser printers
  • Problems with ink-jet printers
  • Problems with dot-matrix printers
printer maintenance
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 manufacturer’s Web site for specific maintenance tips
  • Clean inside and outside of the printer
general printer troubleshooting
General Printer Troubleshooting
  • Isolate the problem
    • Application attempting to use the printer
    • OS and printer drivers
    • Connectivity between PC and printer
    • Printer itself
addressing printer problems caused by hardware
Addressing Printer Problems Caused by Hardware
  • Verify a printer self-page can print
  • Check the printer cable
problems with laser printers
Problems with Laser Printers
  • Poor quality due to low toner
  • Printer stays in warm-up mode
  • Paper Jam or Paper Out message appears
  • Printed images are distorted
  • Printing is slow
  • A portion of the page does not print
problems with ink jet printers
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
problems with dot matrix printers
Problems with Dot-Matrix Printers
  • Print quality is poor
  • Print head moves back and forth but nothing prints
problems printing from windows
Problems Printing from Windows
  • Try to print a test page using the Printer window
  • Print spool might be stalled
  • Reboot PC and verify that printer cable or cable connections are solid
  • Remove and reinstall printer driver
  • In CMOS setup, check configuration of USB, serial, or parallel port that the printer is using
  • Try another printer driver
  • Disable bidirectional support for the printer


problems printing from windows45
Problems Printing from Windows
  • Check resources assigned to printer port
  • Disable “Check Port State Before Printing”
  • Verify printer properties; lower the resolution
  • Disable printer spooling (if you can print from DOS but not from Windows)
  • Application may be incompatible with Windows (Windows 9x)
  • Bypass spooling by printing to a file
  • Try the printer on another PC
troubleshooting networked printers
Troubleshooting Networked Printers
  • Check that you can print from the computer that has the printer attached to it locally by printing a test page using the Printer window
  • At the remote computer, verify that you can access the computer to which the printer is attached
  • Using the Printer window, delete the printer, and then, using Windows 9x Network Neighborhood or Windows 2000/XP My Network Places, reconnect the printer
chapter summary
Chapter Summary
  • Three main types of printers, how they work, and how to support them
  • Printers connect to a PC by way of a parallel port, serial port, USB port, or wireless (radio or infrared) connection
  • How to install a printer
  • How to share a printer with others on a network
  • How troubleshoot printer problems