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Chapter 21

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

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  1. Chapter 21 Supporting Printers

  2. You Will Learn… • How printers work • How to install printers and share them over a local area network • How to troubleshoot printer problems

  3. Main Types of Printers for Desktop Computing • Laser • Ink-jet • Dot-matrix

  4. 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

  5. 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

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

  7. Six Steps of Laser Printing

  8. Step 1: Cleaning

  9. Step 2: Conditioning • Conditions drum to contain a high electrical charge

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

  11. 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)

  12. Step 3: Writing

  13. Step 4: Developing • Toner is placed onto the drum where the charge has been reduced

  14. Step 4: Developing

  15. Step 5: Transferring • Strong electrical charge draws toner off drum onto paper; takes place outside the cartridge

  16. Step 6: Fusing • Heat and pressure fuse toner to paper

  17. 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

  18. 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

  19. Ink-Jet Cartridges

  20. 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

  21. Dot-Matrix Print Head

  22. Printer Manufacturers

  23. 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) continued…

  24. 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

  25. 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

  26. 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

  27. 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

  28. Sharing a Local Printer with Others in a Workgroup (Windows 98)

  29. Sharing a Local Printer Connected to a Windows 2000/XP Workstation

  30. 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)

  31. Using Manufacturer’s Printer Drivers on CD

  32. Using Manufacturer’s Printer Drivers on CD

  33. Using Printer Driverson the Host PC

  34. 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

  35. Troubleshooting Guidelines for Printers • Routine printer maintenance • General printer troubleshooting • Problems with laser printers • Problems with ink-jet printers • Problems with dot-matrix printers

  36. 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

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

  38. Addressing Printer Problems Caused by Hardware • Verify a printer self-page can print • Check the printer cable

  39. 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

  40. Problems with Laser Printers

  41. 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

  42. Problems with Ink-Jet Printers

  43. Problems with Dot-Matrix Printers • Print quality is poor • Print head moves back and forth but nothing prints

  44. 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 continued…

  45. 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

  46. 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

  47. 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

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