1. PC Maintenance: Preparing for A+ Certification Chapter 17: Keyboards and Mice

2. Chapter 17 Objectives Understand keyboard and mouse functionality Understand keyboard and mouse functionality Identify types of keyboards and mice Identify types of keyboards and mice Connect and disconnect keyboards and mice Connect and disconnect keyboards and mice Troubleshoot common problems with keyboards and mice Troubleshoot common problems with keyboards and mice

3. How Keyboards Work Grid of uncompleted circuits Grid of uncompleted circuits Pressing a key completes the circuit Pressing a key completes the circuit Each key sends a different signal Each key sends a different signal Modifier keys (Shift, Ctrl) change the signal that is sent by another key Modifier keys (Shift, Ctrl) change the signal that is sent by another key

4. Keyboard Layouts XT Keyboard, function keys at left, no separate arrow pad XT Keyboard, function keys at left, no separate arrow pad

5. Keyboard Layouts Windows Keyboard, has function keys on top, Windows keys, separate arrow keys Windows Keyboard, has function keys on top, Windows keys, separate arrow keys

6. Keyboard Layouts Dvorak keyboard, different arrangement of keys, requires user retraining, faster typing (by some claims) Dvorak keyboard, different arrangement of keys, requires user retraining, faster typing (by some claims)

7. Keyboard Connectors AT-style (older, larger) AT-style (older, larger) PS/2-style (newer, smaller) PS/2-style (newer, smaller) USB (newest) USB (newest)

8. Standard Ball Mouse Ball rolls past sensors that send electrical pulses to PC Ball rolls past sensors that send electrical pulses to PC Ball removable for cleaning Ball removable for cleaning

9. Optical Mouse Light sensor instead of ball Light sensor instead of ball Sealed case, no cleaning required Sealed case, no cleaning required Lasts longer than a traditional mouse (in theory) Lasts longer than a traditional mouse (in theory)

10. Mouse Variants Trackball Trackball Touchpad Touchpad Light pen Light pen

11. Connecting/Disconnecting USB models can be connected without shutting down PC USB models can be connected without shutting down PC PS/2 mouse can be connected without powering down if Windows fails to detect a mouse at startup PS/2 mouse can be connected without powering down if Windows fails to detect a mouse at startup All other connections/disconnections must be done with power off All other connections/disconnections must be done with power off

12. Adjusting Keyboard in Windows Keyboard properties in Control Panel Keyboard properties in Control Panel Repeat Delay Repeat Delay Repeat Rate Repeat Rate Cursor Blink Rate Cursor Blink Rate

13. Adjusting Mouse in Windows Buttons: Buttons: Swap right and left Swap right and left Double-click speed Double-click speed Pointer Appearance Pointer Appearance Pointer Movement Pointer Movement

14. Troubleshoot Keyboard Problems Keyboard not detected Keyboard not detected Check connection Check connection Bad keyboard Bad keyboard Stuck key message at startup Stuck key message at startup Object resting on keyboard Object resting on keyboard Dirt or object wedged into keys Dirt or object wedged into keys Nonresponsive key Nonresponsive key Clean keyboard Clean keyboard

15. Troubleshooting Keyboard Problems Wrong letters appear when typing Wrong letters appear when typing Check keyboard layout chosen in Windows Check keyboard layout chosen in Windows Remove keyboard from Device Manager and redetect Remove keyboard from Device Manager and redetect Bad keyboard (faulty controller chip inside) Bad keyboard (faulty controller chip inside) Spilled liquid on keyboard Spilled liquid on keyboard If sugared liquid, clean with soap and water If sugared liquid, clean with soap and water Let dry completely Let dry completely Replacement might be necessary Replacement might be necessary

16. Troubleshooting Mouse Problems Pointer does not move at all Pointer does not move at all Mouse disconnected Mouse disconnected Windows locked up (reboot) Windows locked up (reboot) Bad mouse Bad mouse Pointer moves in only one direction Pointer moves in only one direction Mouse requires cleaning Mouse requires cleaning Roller inside is malfunctioning (clean, replace entire mouse) Roller inside is malfunctioning (clean, replace entire mouse)

17. Troubleshooting Mouse Problems Pointer jumps erratically all over screen Pointer jumps erratically all over screen Dirty mouse Dirty mouse Bad or incompatible video driver Bad or incompatible video driver Check in Safe Mode to eliminate driver as possibility Check in Safe Mode to eliminate driver as possibility Extra buttons do not work Extra buttons do not work Software for mouse not installed Software for mouse not installed Touchpad does not click when tapping Touchpad does not click when tapping Software or driver not installed Software or driver not installed