Discussion about the Korg PolySix synthesizer

How do you check for shorts ? Obviously you should check for shorts
between any of the transistor's legs that exists in the Powersupply
section, particulary the 4 ones that are attached to the bck of the
metal case, using a multimeter.




--- In PolySix@yahoogroups.com, "hoggy_bogger" <yanbu@c...> wrote:
> > I'd check the Powersupply board for shorts - I can't remember but 
I 
> > think there should be a few transistors at the area - check them 
out 
> > for shorts.
> 
> I disconnected all the power to the other boards, and just had power
> to the KLM-376, powered on and it blew the fuses (both 250v 1a on 
the
> board).   Obviously there is a short somewhere in that board?  The 
D1
> diode lights up for a sec when it's powered on, then  dims out.  
> 
> Can't seem to find any shorts in there, any idears?  I have a few
> photos here of the board, maybe there's something obvious to you 
guys
> (other than the fuses not being in there, took em out)
> 
> http://www.10eastern.com/images/polysix/poly1.jpg
> http://www.10eastern.com/images/polysix/poly2.jpg
> http://www.10eastern.com/images/polysix/poly3.jpg
> http://www.10eastern.com/images/polysix/poly4.jpg
> http://www.10eastern.com/images/polysix/poly5.jpg
> 
> 
> 
> 
> 
> 
> 
> > --- In PolySix@yahoogroups.com, "hoggy_bogger" <yanbu@c...> wrote:
> > > I'm really hoping I can get some help / advice from you all.  
Ok, 
> > > i'll state the facts once again:
> > > 
> > > My polysix fell out of tune last week, a few days before I was 
> > about 
> > > to play a show, and I decided to get in there and tune it.  I 
got 
> > it 
> > > rock solid in tune, and this is obviously where I went wrong - 
I 
> > had 
> > > it plugged in still -  and closed the cover down to put all the 
> > > screws in and saw a small flash from the center back portion of 
the 
> > > inside.  It seemed like it came from the center back board 
that's 
> > > screwed in with the metal plate, the one that holds the fuses.  
The 
> > > first of the two fuses blew out.  I looked around for quite 
some 
> > time 
> > > to see if I pinched any wires against the case or something 
> > obvious, 
> > > but couldn't find anything.  I bought new fuses and replaced, 
but 
> > > they blow out immediately when powered up.  
> > > 
> > > I'm pretty handy with a soldering iron and such, can plunder my 
way 
> > > through schematics - but not sure where to start and thought I 
> > better 
> > > ask some advice.  Thanks in advance for any help.  The most I 
can 
> > > offer this board is my patch dumps, I have a number that aren't 
in 
> > > your files area.