Hi Robodelfy,
I was gonna reply to your first post and ask if it ran ok on batteries
but you've already gone there.

As the resident electronics engineer and old fart, here's my gut
feeling: it sounds suspiciously like a poor solder joint.

It's always good advice in these cases to just heat up the soldering
iron again and take it to all the bends to re-melt
the solder joint back to a good shiny bead. It certainly won't hurt
and at this point you have nothing to lose. I'd start with the
suspicious switched jack socket that you mentioned.

c²

On Mar 31, 2009, at 1:09 PM, robodelfy wrote:
> Ok, now something very strange is happening.
>
> I was fiddling around by the chip where the main bends are, and I
> foud a couple of points, that if I connected them the sk5 came back
> to life and so far seems to act normally! With batteries things seem
> fine....and with teh power supply plugged in its ok through the
> speaker, but when plugging a jack cable into the switched jack
> socket on the sk5 it makes some crazy squealing noises as you are
> puching it in and when its in the power goes, no led or anything??
>
> Strange, any ideas
>
> If the worst comes to the worst I could always have it just running
> off batteries but it would be shame
>
> --- In CasioSK@yahoogroups.com, "robodelfy" <robodelfy@...> wrote:
> >
> > Hey everyone,
> >
> > I have an SK-5 that I have spent a ridiclous amount of time
> housing in a nice wooden case and bending. It worked fine until the
> other day. I think I might have had my wall-wart thing set to 9v
> instead of 7.5 centre negative. I tried it a couple of times and it
> didnt work..
> >
> > Now the on led comes on normally, but none of teh keys do anything
> or make any sound!!
> >
> > Id be extremely sad if it was a write off, so if anyone has any
> ideas how to bring it back or what might of happened, I would be
> hugely appreciative!
> >
> > :)
> >
> > Thanks