On 13 Apr 2013, at 18:24, adematteo wrote:
solder bridging things it shouldn't, and another time an almost
invisible etching fault. The solder sliver had fallen from a solder
sucker when tweaking/subbing components, and had lodged somewhere
awkward.
Back when my eyes were pretty good, I still didn't spot either until a
magnifying glass was used.
Good luck - hope you find it.
cheers,
Dave
> So, i'm assuming there's an intermittent short or fragile trace thatFWIW, I've been caught by them before - once a *very* tiny sliver of
> i'm not catching ?
solder bridging things it shouldn't, and another time an almost
invisible etching fault. The solder sliver had fallen from a solder
sucker when tweaking/subbing components, and had lodged somewhere
awkward.
Back when my eyes were pretty good, I still didn't spot either until a
magnifying glass was used.
Good luck - hope you find it.
cheers,
Dave
>
> --- In cgs_synth@yahoogroups.com, sasami@... wrote:
> >
> > Okay, those voltages were more or less what I got.
> > Now take a 1k resistor and connect one end to -15. Connect the
> other end of
> > the 1k resistor to each input pin in turn, and read the voltages.
> If all is
> > well, they will read around -14.5 to -15 volts. If any read much
> higher than
> > that, that is probably where the problem is.
> >
> >
> > Below are what I got on those pins with chips IN.
> >
> > >1) -14.3
> > >2) -14.3
> > >3) -14.3
> > >4) -14.5
> > >5) -14.8 (Smooth) +14.8 (Stepped) (this will depend on what the
> module is
> > doing!)
> > >6) -14.5
> > >7) -15
> > >8) -14.9
> > >9) +14.2
> > >10) 0, -0.2 (Stepped)
> > >11) -14.5
> > >12) -14.5
> > >13) -14.5
> > >14) +15
> >
> > Other than that, it would be high-resolution pic time.
> >
> > Ken
> > __________________________________________________________
> > Ken Stone sasami@... otherunicorn@...
> > Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> > Australian Miniature Horses & Ponies
> <http://www.blaze.net.au/~sasami/>
> >
>
>
>