Keyboards and Mice
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This document discusses PC hardware servicing, specifically keyboards and mice. It covers keyboard and mouse functionality, types of keyboards and mice, how to connect and disconnect them, and how to troubleshoot common problems. Keyboards work by completing circuits when keys are pressed, and different keyboard layouts exist. Mice can use a ball or optical sensor to detect movement. Connectors include PS/2, USB, and adjusting settings can be done in Windows Control Panel. Troubleshooting tips are provided for non-responsive keys, wrong letters appearing, and mouse pointer issues.
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- 1. PC Hardware Servicing Chapter 17: Keyboards and Mice
- 2. Chapter 17 Objectives • Understand keyboard and mouse functionality • Identify types of keyboards and mice • Connect and disconnect keyboards and mice • Troubleshoot common problems with keyboards and mice
- 3. How Keyboards Work • Grid of uncompleted circuits • Pressing a key completes the circuit • Each key sends a different signal • Modifier keys (Shift, Ctrl) change the signal that is sent by another key
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- 5. Keyboard Layouts • Windows Keyboard, has function keys on top, Windows keys, separate arrow keys
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- 9. Optical Mouse • Light sensor instead of ball • Sealed case, no cleaning required • Lasts longer than a traditional mouse (in theory)
- 10. Mouse Variants • Trackball • Touchpad • Light pen
- 11. Connecting/Disconnecting • 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 • All other connections/disconnections must be done with power off
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- 15. Troubleshooting Keyboard Problems • Wrong letters appear when typing – Check keyboard layout chosen in Windows – Remove keyboard from Device Manager and redetect – Bad keyboard (faulty controller chip inside) • Spilled liquid on keyboard – If sugared liquid, clean with soap and water – Let dry completely – Replacement might be necessary
- 16. Troubleshooting Mouse Problems • Pointer does not move at all – Mouse disconnected – Windows locked up (reboot) – Bad mouse • Pointer moves in only one direction – Mouse requires cleaning – Roller inside is malfunctioning (clean, replace entire mouse)
- 17. Troubleshooting Mouse Problems • Pointer jumps erratically all over screen – Dirty mouse – Bad or incompatible video driver – Check in Safe Mode to eliminate driver as possibility • Extra buttons do not work – Software for mouse not installed • Touchpad does not click when tapping – Software or driver not installed