Hi Dan
Thanks for the info thats very interesting.
I know the external supply is ok because i use it with my working
poly 800. Im now thinking about checking the internal power supply
and am quite handy with a soldering iron. Do you know what i should
test or replace, i have downloaded the schematics but dont know the
best place to begin.
Regards
Neil
--- In
korgpolyex@yahoogroups.com, Dan Brewton <dannobe123@y...>
wrote:
> Hi......... The next highest Probability, to me, is the Power
Supply within the Unit....
> These do fail occasionally.....Internally there is both a +5 volt
and -5 volt regulated
> supply system ,derived from the 12DC volts input
externally......sometimes people get lazy and plug most anything
into the jack, and , wallah, its toast.......but one saving grace is
this one dies without allowing massive over-voltage to the sensitive
logic circuits that need no more than 5 volts.....usually......cant
know for sure until the supply is fixed, then you get to discover if
the 'next layer' survived......These Power supplies are a bit
difficult to repair... known as "switchers" .....pretty
tricky......some guys I know just gut it out and
> replace with external supply, regulated +/- 5
volts.......naturally you need the schematics
> for all this....... let me know !
> Cheers
> Dan