Re: [Paparazzi-devel] Reply to "Problems with USB Programmer (David Conger)"

[David Carlson]

David,

Most likely problem is that the 5V bus is shorted to the 3.3V bus.  I'd 
recommend grabbing a magnifying glass and see if you can find any 
obvious shorts.

Another possibility is a ground loop.  Make sure the 3.3V regulator is 
properly grounded.

Besides those, I would be out of ideas.

Buzz

David Conger wrote:
> Hello Chris,
> Thank you for the information. I am unable to check the PCB track 
> unless there is a very easy way to manually check.
> I tried replacing the 3.3v regulator but still I get 5v at the 3.3v end.
> I'm wondering if maybe 5v comes backwards to the 3.3v end of the 3.3v 
> regulator somehow via short?
> -David
> On Jul 19, 2009, at 9:14 AM, chris wrote:
>
> > David the pcb tracks are damaged or just the 3.3 volt regulator?
> > The only way to burn the 3.3v regulator is by heat caused by 
> > excessive current draw since the input voltage is fixed by the 5v 
> > regulator i guess.
> > Another possible cause is the accidental connection of the 3.3v rail 
> > with the 5v rail.
> > Can you check for a broken pcb track from excessive current?
> > Chris
> >
> >
> >
> >
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