Five-step Troubleshooting

Verify The Complaint

Turn on all the components in the problem circuit to verify the client complaint Note the symptoms Do not begin disassembly or testing until you have narrowed down the problem area

Analyze The Schematic

Look up the schematic for the problem circuit Determine how the circuit is supposed to work by tracing the current paths from the power feed through the circuit components to ground If several circuits fail at the same time, the fuse or a ground is a likely cause

Based on the symptoms and your understanding of the circuit operation, identify one or more possible causes of the problem

Isolate The Problem By Testing The Circuit Make circuit tests to check the diagnosis you made in step 2 Keep in mind that a logical, simple procedure is the key to efficient troubleshooting Test for the most likely cause of failure first Try to make tests at points that are easily accessible
Fix The Problem

Once the specific problem is identified, make the repair Be sure to use proper tools and safe procedures

Make Sure The Circuit Works
Turn on all components in the repaired circuit in all modes to make sure you've fixed the entire problem If the problem was a blown fuse, be sure to test all of the circuits on the fuse Make sure no new problems turn up and the original problem does not recur