Diagnosing faults: Difference between revisions
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Diagnosing the problem can often be the hardest part of a fix, in which case a methodical approach may save you a lot of frustration and wasted time. Here are some tips for how to proceed. | Diagnosing the problem can often be the hardest part of a fix, in which case a methodical approach may save you a lot of frustration and wasted time. Here are some tips for how to proceed. | ||
== Our troubleshooting tips == <!--T:2--> | == Our troubleshooting tips == <!--T:2--> | ||
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This is one of the hardest things to "teach" - it is mostly learned through experience. This is like a kungfu dojo - the more you practice, the more you have confidence in the tools/process. But here are some tips. | This is one of the hardest things to "teach" - it is mostly learned through experience. This is like a kungfu dojo - the more you practice, the more you have confidence in the tools/process. But here are some tips. | ||
===What to avoid=== <!--T:4--> | ===What to avoid=== <!--T:4--> | ||
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*Don't leap to easy conclusions! | *Don't leap to easy conclusions! | ||
*Avoid "blind alleys" | *Avoid "blind alleys" | ||
===Gathering the evidence=== <!--T:6--> | ===Gathering the evidence=== <!--T:6--> | ||
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* Passive testing (e.g. with a meter - resistance can be useful) | * Passive testing (e.g. with a meter - resistance can be useful) | ||
* Functional testing (when safe and possible) | * Functional testing (when safe and possible) | ||
===Following a logical process=== <!--T:8--> | ===Following a logical process=== <!--T:8--> | ||
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* It really helps to know how something works! (This may sound obvious, but it's worth reading about how the e-thing works.) | * It really helps to know how something works! (This may sound obvious, but it's worth reading about how the e-thing works.) | ||
* Start investigating in a logical, sequential way where you move from parts you know are working towards parts you know are not working. | * Start investigating in a logical, sequential way where you move from parts you know are working towards parts you know are not working. | ||
===Getting help=== <!--T:10--> | ===Getting help=== <!--T:10--> | ||
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* If you're running out of ideas, explain the problem to someone else. If there's a flaw in your logic or another way to tackle the problem you may well see it even before you finish the explanation, even if your audience didn't understand a word you said or only asked silly questions! | * If you're running out of ideas, explain the problem to someone else. If there's a flaw in your logic or another way to tackle the problem you may well see it even before you finish the explanation, even if your audience didn't understand a word you said or only asked silly questions! | ||
* Creep up on a problem from every possible angle. Sooner or later, with luck, you'll catch it out. | * Creep up on a problem from every possible angle. Sooner or later, with luck, you'll catch it out. | ||
===Root cause or causal factor?=== <!--T:12--> | ===Root cause or causal factor?=== <!--T:12--> | ||
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* Fixing the "root cause" will permanently clear the fault. | * Fixing the "root cause" will permanently clear the fault. | ||
* Fixing only a "causal factor" (such as replacing a blown fuse) may make something work again, by the "root cause" may still be present and the fault will reoccur. | * Fixing only a "causal factor" (such as replacing a blown fuse) may make something work again, by the "root cause" may still be present and the fault will reoccur. | ||
==And Now ...== <!--T:14--> | ==And Now ...== <!--T:14--> | ||
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Don't forget to visit our [[ | Don't forget to visit our [[Case Studies|Case Studies]] page to see some of these principles in operation. | ||
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[[Category:Fixing]] | [[Category:Fixing]] | ||
</translate> | </translate> | ||
Revision as of 10:31, 24 July 2021
Diagnosing the problem can often be the hardest part of a fix, in which case a methodical approach may save you a lot of frustration and wasted time. Here are some tips for how to proceed.
Our troubleshooting tips
This is one of the hardest things to "teach" - it is mostly learned through experience. This is like a kungfu dojo - the more you practice, the more you have confidence in the tools/process. But here are some tips.
What to avoid
- Don't leap to easy conclusions!
- Avoid "blind alleys"
Gathering the evidence
We have a number of ways to gather evidence about the fault, often we have to mix and match.
- Description of the fault from the owner/user (sometimes this can be misleading and/or 'wrong')
- Nature of the onset
- Visual evidence
- Passive testing (e.g. with a meter - resistance can be useful)
- Functional testing (when safe and possible)
Following a logical process
- It really helps to know how something works! (This may sound obvious, but it's worth reading about how the e-thing works.)
- Start investigating in a logical, sequential way where you move from parts you know are working towards parts you know are not working.
Getting help
- Remember, search engines are your best friend, but to get a good answer, you need to ask a good question.
- If you're running out of ideas, explain the problem to someone else. If there's a flaw in your logic or another way to tackle the problem you may well see it even before you finish the explanation, even if your audience didn't understand a word you said or only asked silly questions!
- Creep up on a problem from every possible angle. Sooner or later, with luck, you'll catch it out.
Root cause or causal factor?
- Fixing the "root cause" will permanently clear the fault.
- Fixing only a "causal factor" (such as replacing a blown fuse) may make something work again, by the "root cause" may still be present and the fault will reoccur.
And Now ...
Don't forget to visit our Case Studies page to see some of these principles in operation.