PC Maintenance: PC Maintenance: Preparing for A+ Preparing for A+
CertificationCertificationChapter 17: Keyboards and MiceChapter 17: Keyboards and Mice
Chapter 17 ObjectivesChapter 17 Objectives
Understand keyboard and mouse Understand keyboard and mouse functionalityfunctionality
Identify types of keyboards and miceIdentify types of keyboards and mice Connect and disconnect keyboards and Connect and disconnect keyboards and
micemice Troubleshoot common problems with Troubleshoot common problems with
keyboards and micekeyboards and mice
How Keyboards WorkHow Keyboards Work
Grid of uncompleted circuitsGrid of uncompleted circuits Pressing a key completes the circuitPressing a key completes the circuit Each key sends a different signalEach key sends a different signal Modifier keys (Shift, Ctrl) change the Modifier keys (Shift, Ctrl) change the
signal that is sent by another keysignal that is sent by another key
Keyboard LayoutsKeyboard Layouts
XT Keyboard, function keys at left, no XT Keyboard, function keys at left, no separate arrow padseparate arrow pad
Keyboard LayoutsKeyboard Layouts
Windows Keyboard, has function keys on Windows Keyboard, has function keys on top, Windows keys, separate arrow keystop, Windows keys, separate arrow keys
Keyboard LayoutsKeyboard Layouts
Dvorak keyboard, different arrangement of Dvorak keyboard, different arrangement of keys, requires user retraining, faster typing keys, requires user retraining, faster typing (by some claims)(by some claims)
Keyboard ConnectorsKeyboard Connectors
AT-style (older, larger)AT-style (older, larger) PS/2-style (newer, smaller)PS/2-style (newer, smaller) USB (newest)USB (newest)
Standard Ball MouseStandard Ball Mouse
Ball rolls past Ball rolls past sensors that send sensors that send electrical pulses electrical pulses to PCto PC
Ball removable for Ball removable for cleaningcleaning
Optical MouseOptical Mouse
Light sensor instead of ballLight sensor instead of ball Sealed case, no cleaning requiredSealed case, no cleaning required Lasts longer than a traditional mouse (in Lasts longer than a traditional mouse (in
theory)theory)
Mouse VariantsMouse Variants
TrackballTrackball TouchpadTouchpad Light penLight pen
Connecting/DisconnectingConnecting/Disconnecting
USB models can be connected without USB models can be connected without shutting down PCshutting down PC
PS/2 mouse can be connected without PS/2 mouse can be connected without powering down if Windows fails to detect a powering down if Windows fails to detect a mouse at startupmouse at startup
All other connections/disconnections must All other connections/disconnections must be done with power offbe done with power off
Adjusting Keyboard in WindowsAdjusting Keyboard in Windows
Keyboard Keyboard properties in properties in Control PanelControl Panel
Repeat DelayRepeat Delay Repeat RateRepeat Rate Cursor Blink RateCursor Blink Rate
Adjusting Mouse in WindowsAdjusting Mouse in Windows
Buttons:Buttons: Swap right and leftSwap right and left Double-click speedDouble-click speed
Pointer Pointer AppearanceAppearance
Pointer MovementPointer Movement
Troubleshoot Keyboard Troubleshoot Keyboard ProblemsProblems
Keyboard not detectedKeyboard not detected Check connectionCheck connection Bad keyboardBad keyboard
Stuck key message at startupStuck key message at startup Object resting on keyboardObject resting on keyboard Dirt or object wedged into keysDirt or object wedged into keys
Nonresponsive keyNonresponsive key Clean keyboardClean keyboard
Troubleshooting Keyboard Troubleshooting Keyboard ProblemsProblems
Wrong letters appear when typingWrong letters appear when typing Check keyboard layout chosen in WindowsCheck keyboard layout chosen in Windows Remove keyboard from Device Manager and Remove keyboard from Device Manager and
redetectredetect Bad keyboard (faulty controller chip inside)Bad keyboard (faulty controller chip inside)
Spilled liquid on keyboardSpilled liquid on keyboard If sugared liquid, clean with soap and waterIf sugared liquid, clean with soap and water Let dry completelyLet dry completely Replacement might be necessaryReplacement might be necessary
Troubleshooting Mouse Troubleshooting Mouse ProblemsProblems
Pointer does not move at allPointer does not move at all Mouse disconnectedMouse disconnected Windows locked up (reboot)Windows locked up (reboot) Bad mouseBad mouse
Pointer moves in only one directionPointer moves in only one direction Mouse requires cleaningMouse requires cleaning Roller inside is malfunctioning (clean, replace Roller inside is malfunctioning (clean, replace
entire mouse)entire mouse)
Troubleshooting Mouse Troubleshooting Mouse ProblemsProblems
Pointer jumps erratically all over screenPointer jumps erratically all over screen Dirty mouseDirty mouse Bad or incompatible video driverBad or incompatible video driver Check in Safe Mode to eliminate driver as Check in Safe Mode to eliminate driver as
possibilitypossibility Extra buttons do not workExtra buttons do not work
Software for mouse not installedSoftware for mouse not installed Touchpad does not click when tappingTouchpad does not click when tapping
Software or driver not installedSoftware or driver not installed