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