phb.hfx at gmail.com
Fri Feb 3 14:38:14 CST 2017
On 2017-02-03 3:47 PM, Tony Duell wrote:
> On Fri, Feb 3, 2017 at 7:04 PM, dwight <dkelvey at hotmail.com> wrote:
>> I think Tony's statement about the key thing to know about
>> trouble shouting is to know what it should be doing.
>> If you don't know that, no scope or logic analyzer with help much.
> Yes. I once explained faultfinding in this way. The technical manual,
> schematics, microcode listings, etc should tell you what the device
> should be doing. The instruments tell you what it is doing, you need
> test instruments becuase you can't directly 'see' electrical signals.
> You then have to compare the two and work out what could cause
> the problem.
> There is no magic box that you plug into a computer and it tells
> you 'U5 is faulty'. At least not in general.
> As I have said before, the most important piece of test gear is a
...And if you don't have a schematic, you ring out the connections and
draw your own...
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