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Compressed air A lint-free cloth
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Try to avoid using older (pre-2004) laptop keyboards, as many older laptop keyboards used a delicate type of scissors key connector that would shatter if pried off
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In this exercise, you ll dismantle one or more keyboards, cleaning up the keyboard components in the process before reassembling the device(s) and testing for functionality Step 1 Disconnect the keyboard from the Windows system Try prying off two or three keys using the athead screwdriver (see Figure 18-3) Include more dif cult keys such as the SPACEBAR, ENTER/RETURN, and a key from the center of the keyboard such as the letter G Inspect the bottom of the key and the key post that it sits on how much dirt is there Reinsert the keys, making sure they are snapped all the way down Step 2 Test the keyboard by plugging it into a Windows system If any of the keys you removed aren t working, double-check that they re properly snapped in Shut down the system and remove the keyboard Repeat this process until all keys are working
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Figure 18-3 Removing the CTRL key with a screwdriver
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Note What should you do if you break a key Well, nobody sells replacement parts for keyboards they re just too darn cheap to bother! You might be lucky enough to have a nonworking keyboard that s the exact same model, which you can cannibalize; otherwise, just consign the affected keyboard to the scrap heap after you ve used it for this lab
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Step 3 Insert the nozzle of the compressed air under a key and start blasting away If the keyboard is really old or looks dirty, you may want to do this outside! Did you see any dust or crumbs come out Step 4 Completely dismantle the keyboard Most keyboards have a number of screws underneath that you must rst remove to begin this process Inspect the screws are they different sizes Keep track of which screw goes into which hole Step 5 The inside of the keyboard will have a number of plastic contact templates (see Figure 18-4) Remove these, keeping track of their relation to each other so you can reassemble them Wipe down each template with the lint-free cloth dampened with water If you run into serious dirt, add a bit of mild detergent and repeat until the keyboard is clean
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Hint All keyboards have small circuit boards inside as well Don t get them wet!
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Figure 18-4 Inside a keyboard
Key Term Quiz 377
Step 6 After allowing everything to dry, reassemble the keyboard and test it on a Windows system If the keyboard is not working properly, dismantle it and try again
Lab Analysis Test
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Why is it very important that you always install a USB device s driver before you physically install the USB device John encounters a system with a Bluetooth USB device installed, and the user is complaining that many of the features that should be included with this device don t seem to exist What does he need to do to x this problem Beth s brand-new USB keyboard has a piece of the packaging stuck under the keyboard in such a way that she simply can t pull it out, even with a pair of needle-nose pliers What should she do to x this problem USBDeview is an interesting tool for observing how USB works How might this tool come in handy for diagnosing USB problems Ken has just purchased a fast new 4-GB USB ash drive, complete with the latest U3 smart drive technology He plugs it into his older IBM laptop using the USB 10 ports on the system What should he expect to have happen
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Key Term Quiz
Use the following terms to complete the following sentences Not all terms will be used driver Full-Speed Hi-Speed human interface device Low-Speed Standard Enhanced Host Controller Standard OpenHCD Host Controller SuperSpeed USB host controller USB hub USB mass storage USBDeview
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