Troubleshooting Basics

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TROUBLESHOOTING BASICS What is Troubleshooting? Events or inputs to the system are expected to generate specific results or outputs Any unexpected or undesirable behavior is a symptom Troubleshooting is the process of isolating the specific cause or causes of the symptom

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TROUBLESHOOTING BASICS What is Troubleshooting?

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TROUBLESHOOTING BASICS The Four Steps to Troubleshooting Determine the symptoms Isolate the defective component Take corrective action Localize the problem

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TROUBLESHOOTING BASICS 1952 Ford

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TROUBLESHOOTING BASICS Theory of Operation Understanding what events or inputs to the system are expected to generate specific results or outputs Recognizing any unexpected or undesirable behavior. Understanding the sequence of events in the operational process to assist with isolating the specific cause or causes of the symptom

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TROUBLESHOOTING BASICS Understanding “Expectations” An example of an anticipated sequence of events related to paper feed Paper moves from point to point in a printer Movement timing is determined by paper size, print resolution, and path selected Multiple “sensing” points provide multiple opportunities for expectations to be missed.

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TROUBLESHOOTING BASICS Sequence of Events

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TROUBLESHOOTING BASICS Inter-Dependencies Computer Hardware Operating System Applications Peripherals Low-Level Drivers High-Level Drivers Network Topology N.O.S.

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TROUBLESHOOTING BASICS Troubleshooting Resources Stand Alone Diagnostics POST LED’s Loop-Back Tests Manuals Operators Guide Technical (Hardware) Guide Web Sites Manufacturers’ Website Wikipedia, etc. Forums /Blogs Other peoples’ experience Tools Drawings, Charts, & Diagrams Meters and other diagnostic tools

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TROUBLESHOOTING BASICS Troubleshooting Resources Drawings, Charts, and Diagrams Schematic Drawings Block Diagrams Point-To-Point Drawings Timing Charts Cause and Effect Diagram Decision Trees /Flowcharts

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TROUBLESHOOTING BASICS Schematic Drawings

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TROUBLESHOOTING BASICS Block Diagrams

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TROUBLESHOOTING BASICS Point-to-Point Drawings

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TROUBLESHOOTING BASICS Timing Charts

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TROUBLESHOOTING BASICS Timing Charts

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TROUBLESHOOTING BASICS Cause and Effect Diagram

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TROUBLESHOOTING BASICS Decision Trees

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TROUBLESHOOTING BASICS Flowcharts

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TROUBLESHOOTING BASICS Meters To Measure Resistance: Remove the voltage source Place the ohm meter across the two point in question To Measure Current: Break the circuit where you wish to measure the current Place the ammeter in series with the circuit To Measure Voltage: Place the volt meter across the component in question Troubleshooting Resources

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TROUBLESHOOTING BASICS Hands-On Experience Locating and accessing appropriate test points Efficient dis-assembly and re-assembly Proper parts handling and replacement procedures. Experience the “theory” in operation

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TROUBLESHOOTING BASICS Conclusion What you know is more important than what you do Troubleshooting can’t be “winged” Know before you go Never stop learning and applying that knowledge