Troubleshooting Techniques - Technology
Contents
1. TET ee Troubleshooting Techniques Copyright 2004 D L Gould amp Niagara College Niagara College Technology E is a r E a EJ a Y eoan gt 9 Trouble 9 2 9 O The project does not partially or completely 29 function under all relevant conditions 220 le Troubleshooting 295 An interweaving process of systematic analysis and testing E Troubleshooting Tools 2 e E Am m 217 L an oe 9 Preliminary testing of the project Learning and using the basic electrical and 9 FE me ul f P electronic rules p 9 Implementing basic Troubleshooting 4 Procedures Using the human senses Using troubleshooting guides amp flow charts Repairing amp documenting the test results and recommendations E Preliminary Testing 29 Preventive maintenance before applying power e Confirmation of all component identification mi 2 9 O9 Visual inspection of the location and orientation 2 ofall components 29 Verification of all solder connections 1o d 2a A wiring check on and off the printed circuit 22 2 Visual checks on all wire ends and insulation p m Et udi Electrical Electronic Rules e Kirchoff s Laws Voltage drops across the loads in a 2 9 series circuit are equal to the applied voltage Current 2 9 entering a junction will be equal2. to the current flowing out 29 ofthat same junction 2 9 e Ohm s Law A relationship among voltage current and 2 9 resistance One volt applied to a circuit produces one amp 2 8 of current flow through one ohm of resistance 2 9 Watt s Law A relationship among voltage current and 2 9 power Electrical power in a circuit is equal to the product 2 9 of the current and voltage in that circuit 2 9 Series Circuit A circuit that has one path for current flow 2 9 Parallel Circuit A Circuit that has two or more paths for 2 9 current to flow QA Basic Troubleshooting Procedure ge T PN AS Sa 4 Ll fa fe O jac r7 Te W s ADA 9 B E a 4 f l Ld SALL Gw Ul Localize the faulty circuit Repair Document amp Recommend 293 22 lo lo is 1o 12 r gt f gt Human Senses in Troubleshooting 12 3 90 Eyes frayed wiring damaged printed circuit traces burnt components umi Nose burnt components or burnt wiring 9 Ears locate a missing or interfering signal ice Touch overheating in a circuit or component Ta Le Lo le E 2 Troubleshooting Flow Charts Adapter Plugged In Is there clock outpu Check FPT4 at FPT4 Check pin 3 of LM555 Check FPT4 s there clock outpu Is there clock output Check pin 3 of LM555 at FPT4 at pin 3 of LM555 s there clock output Check pin 3 of at pin 3 of LM555 LM555 The clock circui
3. try does not seem to function a Ta 229 12 29 lo a le E le lo 2 AU UR E Documentation I checklist of procedures during testing 2 23 historical record for the unit 3 9 assist with future repair T show reliability of the unit over time 1 e record of repair time and cost I record of contacts with vendors and service personal identification of a manufactures design flaw 2 9 a service report to the unit owner 1 5 a record of the name of the service tech recommendations for reliable use of the unit m jo E Summary 2s 2 96 When all else fails read the instructions i a 9 Basic electrical and electronic rules need to 223 be learned i 9 Remember the basic six step troubleshooting I procedure 2 Use your senses 4 9 Follow the service manual guides 90 Document the fault La fa Where to get more information P 29 Electronic Project Design and Fabrication Third Edition a y Ronald A Reis Ta O Troubleshooting Electronic Devices by Joel Goldberg e Iroubleshooting amp Equipment Care ie The Universal Troubleshooting Process gt gt 2
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