Why can I find steady faults but not intermittent ones?
You know your trade. A steady fault, you solve in an hour — the part is broken, the meter proves it, you replace it. Now something flickers, drops, comes back before you can test it, and you stand there with a meter reading nothing wrong. This is not a gap in your knowledge. It is a gap in method. You are still looking for the fault at rest. An intermittent fault only exists in motion — under vibration, under heat, under a certain load, at a certain angle of a wire you have not yet moved. The work now is to stop diagnosing the part and start diagnosing the condition that breaks it. Reproduce the failure on your terms, in your shop, under your control — or you will chase it in the field forever.
You are hunting intermittent faults the same way you hunt steady ones — by staring at the part. Stop. An intermittent fault is not a broken thing, it is a condition. Find what triggers it — vibration, heat, moisture, load — and it will show itself. Chase the trigger, not the symptom.
What changes unlock by starting
- You build a repeatable method for reproducing intermittent faults instead of hoping to catch one by luck.
- You stop losing hours standing over a dead circuit waiting for it to misbehave.
- You can explain the condition behind a failure, not just swap a part and hope.
- You build a mental library of trigger conditions that speeds every future intermittent job.