Diagnosing a problem 18b modified


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  • For example, you walk into a dark room and turn on the wall-mounted light switch and the light does not come on. Is the wall-mounted light switch the problem? Probably not. The bulb may have burned out, the power cord may be unplugged from the receptacle, or perhaps the switch on the light fixture has been turned off. Most people would repeatedly flip the light switch on/off a few times thinking that the cause was the switch.
  • "Is it plugged in and does that receptacle have power?“ For example, my neighbor had a bicycle with two flat tires. He put air in them and took off down the street only to come back a few minutes later walking his bike. He said the tires went flat. He put air in the tires again and checked the valves for leaks and everything seemed fine. A few minutes later the air was out of the tires again. After some troubleshooting and close inspection of the tires we discovered dry rot. Dry rot is the decay of a substance without the presence of water. Tire rubber will rot if not used for a long periods of time, which cause cracks in the rubber along the rim. Sometimes the cracks are hard to see unless you know what to look for. When the rider sat on the bicycle the weight caused the tire rubber to expand and split and the air leaked out of the tires. The solution to his problem was a simple one ― he had to purchase new tires for the bike.
  • A good symptom description minimizes the risk of "fixing the wrong problem", and helps determine the facts if there's a suspicion that you made the problem worse. Don’t take something apart if it is not necessary. If you do take something apart make sure you know how to put it back together.
  • For example, you could establish regular schedules to change the air filters in your home or to change the oil in the car. If certain products or systems fail, it is important that you be able to diagnose, troubleshoot, and repair them.
  • These are servicing acts and are usually performed at a specific point in time. The goal of servicing is to keep the product, structure, or system in good working order.
  • Having a clear understanding of the severity of the problem is key to deciding if more experienced help is needed. Much information about how to diagnose and repair a product or system is contained in the product’s service manual.
  • All systems should function the way they were designed. These systems may include two-way communication radios, transportation systems that move goods from one place to another, and power systems that convert solar energy to electrical energy.
  • Tools, machines, and systems make each of our lives more comfortable. They also injure or kill thousands of people each year. Every day local newspapers report injuries and deaths caused by careless use of such tools and machines as home appliances, factory machinery, and automobiles.
  • Diagnosing a problem 18b modified

    1. 1. Diagnosing a Problem 18b
    2. 2. Diagnosing a Problem The focus of this lesson is going to examine- Troubleshooting- Preventative maintenance- Repair- Procedures and safety
    3. 3. Diagnosing a Problem: TroubleshootingTroubleshooting is a form ofproblem solving. It is thesystematic search for the sourceof a problem so that it can besolved. Troubleshooting is oftena process of elimination ―eliminating potential causes of aproblem.
    4. 4. Diagnosing a Problem: Troubleshooting- Usually applied to something that has suddenly stopped working- First focus should be on what has changed- Do not jump to false conclusions of causality — the logical relationship between one physical event (called cause) and another physical event (called effect) being the direct consequence (result) of the first event.
    5. 5. Diagnosing a Problem: Troubleshooting- Start from the simplest and most probable problems first- Further steps are to check each component in a system one by one and to substitute known good components for any suspect ones .
    6. 6. Diagnosing a Problem: TroubleshootingWhat if you can’t fix it?- Call in a specialist- Give them a complete and accurate symptom description to ensure the quickest and most accurate solution. The more detailed the symptom description, the less work youll need to do and you will save a lot of time.
    7. 7. Diagnosing a Problem: Preventative MaintenanceFix a problem before it starts:Preventative maintenance !!!Establishing maintenance schedules help toprevent breakdowns
    8. 8. Diagnosing a Problem: Preventative MaintenanceMost maintenance is done on a schedule.The schedule is designed to keep the productworking properly. Many products come with amaintenance manual. This document lists:– The types of maintenance needed– Methods of performing maintenance– A time to schedule for each maintenance task
    9. 9. Diagnosing a Problem: Preventative MaintenanceBuildings and otherconstructed structuresneed maintenance just likemanufactured products.Building must be cleanedand painted. Windows arecleaned. Roofs are sealedto prevent leaks. Bridgesand communication towersare painted to preventrusting. Railroad tracksare leveled, and switchesare lubricated. Streets anddriveways receive periodic Worker diagnosing acoatings to seal out water. problem on a house prior to painting
    10. 10. Diagnosing a Problem: Preventative MaintenanceUpkeep is a term that is often used inconjunction with or in place of the termmaintenance. Upkeep refers to all the costsand actions required to keep products andsystems operating properly.
    11. 11. Diagnosing a Problem: RepairNo product or structurewill work all the time orlast forever. Someproducts are used untilthey stop functioning An old paperclip used as a link to a metal chain link fenceand are then discarded.For example, few of ustry to salvage bentpaper clips or bolts withstripped threads. Some old rusting nuts and bolts
    12. 12. Diagnosing a Problem: RepairMany products,however, are too costlyto discard the first timethey stop working.Throwing away abicycle or a car everytime a tire goes flatwould be veryexpensive. It cost lessmoney to repair the Man repairing a flat tireproduct.
    13. 13. Diagnosing a Problem: RepairRepairing a buildingmay include replacingdamaged ceiling tile,applying new wallcoverings, or fixing ahole in the wall.Product repair caninvolve replacingworkout or broken partsand adjustingmechanisms. Two women reviewing plans for an addition to a home with a construction home builder
    14. 14. Diagnosing a Problem: RepairRepair is the process of putting a productback into good working order. This requiresthree steps:– Diagnosis: The cause of the problem is determined– Replacement or adjustment : Worn or broken parts are replaced. Misaligned parts are adjusted– Testing: The repaired product must be tested to ensure that it works properly
    15. 15. Diagnosing a ProblemUsing products makes our lives better.However, we must use products wisely. Eachproduct and structure should receive periodicmaintenance and necessary repairs so theywork at peak performance.
    16. 16. Diagnosing a Problem: Safety and ProceduresUsing safeprocedures andfollowingdirections isabsolutelyessential toensuring an A building inspector standing underaccident-free scaffolding pointing out the WARNING sign posted on the job-site.workingenvironment.
    17. 17. Diagnosing a Problem: Safety and Procedures Systems should operate so that theyfunction in the way they weredesigned. All systems are designedwith safety in mind for the user. Usingsafe procedures and followingdirections is absolutely essential toensuring an accident-free environment .
    18. 18. Diagnosing a Problem: Safety and ProceduresSystems aredesigned for safeoperation.Altering thesystem orchanging thesteps negates theprecision and The school bus incorporatessafety. a stop sign and flashing red light as part of the safety system for students.
    19. 19. Diagnosing a Problem: Safety and ProceduresMany people ignorea railroad crossingsignal and armwhen a train iscoming andpurposely goaround the arm tobeat the trainbecause they don’twant to wait. Theywould rather Safety system for railroadjeopardize their track crossing
    20. 20. Diagnosing a Problem: Safety and ProceduresMany drivers willignore the trafficsystem by runningred lights,speeding, talkingand sending textmessages on cellphones while How would you like todriving. drive through this traffic system intersection?
    21. 21. Diagnosing a Problem: Safety and ProceduresWalkers tend to thinkthat a crosswalk ensuresa safety system incrossing a street, butunfortunately thats justnot the case.Communities nationwideare making efforts toeducate both drivers andpedestrians of thepotential dangers ifproper caution is notexercised.
    22. 22. Diagnosing a Problem: Safety and ProceduresYou must beconcerned about yoursafety and the safetyof those around you.Likewise, you mustcomplete tasks usingsafe actions. Alteringthe way a system issupposed to be usedor overriding the These construction workers aresystem procedure is tying a rebar cage for a bridgean unsafe practice. foundation using a tested system for bridge construction.
    23. 23. Diagnosing a Problem: Safety and ProceduresHere is a perfectexample of how aperson ignoredsafety and altereda device. This guycalled this a lawn This is a good example of altering acycle. It is an grass cutting system. You decide…good or bad idea or just plain stupid?accident waiting tohappen.
    24. 24. Diagnosing a Problem: Safety and ProceduresContinuous changes in technology,environmental regulation and publicsafety concerns make the analysis ofcomplex safety-critical systems moreand more demanding.
    25. 25. Diagnosing a Problem: Safety and ProceduresFor example, ridingmowers have atendency to roll overon a hillside if notused properly by theoperator. This hasprompted industry toadd roll bars on This lawnmower has a roll bar to protect the operator from rolling over oncertain types of an incline. These mowers also have seat belts that must be used forriding lawnmowers. additional protection.
    26. 26. Diagnosing a Problem: Safety and ProceduresIn spite of all the technologicalsafety systems in place and thetraining that people receive in theworkplace, more than 14,000workers die from accidents in theU.S. each year while 2.2 millionsuffer disabling injuries.