Re: Multilayer board, track tracing?

On 5/19/2009 7:42 AM Gareth Magennis spake thus:

"Arfa Daily" <arfa.daily@xxxxxxxxxxxx> wrote in message news:gQtQl.84400$mS6.37204@xxxxxxxxxxxxxxxx

"N_Cook" <diverse@xxxxxxxxx> wrote in message news:gutmcd$do8$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>
Any tips for single ended signal injection and tracing for high resolution tracing , floppy/HD head as searchcoil ?

I would have thought that any tracks which passed internally between power and ground planes, would have struggled to radiate
enough signal to be picked up in the way that you are envisioning.
Also, where there are fine-pitch 'bunches' of tracks which run
parallel to one another for any distance, I would think that
crosstalk might become a problem to this technique. If such a board
has any (internal) tracking problems, I don't think that you are
going to do a lot with it anyway. Even if it is just generally
faulty in some way, if the board is complex enough to require
multi-layering, I think you are going to be pissing in the wind
attempting a (commercially viable) repair without the benefit of at
least schematics
...

I would second that. I doubt the time and effort spent in attemptng
this is time and effort well spent. You'd be better off going for a
nice walk in the countryside instead, after telling your customer
this is not a viable repair. Which you or he wll end up doing
anyway.

I third that. Much as I commend the spirit of trying to fix everything yourself that is possible, some things just aren't made to be fixed. Multilayer circuit boards seem to be one of those things.


--
Found--the gene that causes belief in genetic determinism
.