Troubleshooting Procedures

1. VERIFY THE PROBLEM
Operate the problem circuit to check the accuracy of the complaint. Note the symptoms of the inoperative circuit.

2. ANALYZE THE PROBLEM
Refer to the schematic diagram. Determine how the circuit is supposed to work by tracing the current path(s) from the power source through the circuit components to ground. Based on the symptoms noted in step 1 and an understanding of the circuit operation, identify one or more possible causes of the problem.

3. ISOLATE THE PROBLEM
Make circuit tests to prove or disprove the preliminary diagnosis made in step 2. 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.

4. REPAIR THE PROBLEM
Once the specific problem is identified, make the repair using the proper tools and safe procedures.

5. VERIFY THE REPAIR
Operate the circuit to check for satisfactory circuit operation. Good repair practice calls for rechecking all circuits that have been worked on.