Discussion about the Korg PolySix synthesizer

Q5 is where I got the transistor from. I'm pretty sure that it's a 2sc2785.  If I remember correctly from studying power supplies, it is a current overload protection transistor;  when the current on R2 gets high enough to create a 0.7 v drop across the BE junction of Q5, Q5 turns on and shuts down Q2.  

I'm going to give Q2 the good old diode test now that I think about it because it might also be faulty.  Its been about six or seven months since I've been in this synth and I don't remember exactly what I did to it.

On another note, I've also got a KLM-367 clone that I never got working.  Obviously, I've got to get the 5 volt rail up first before I can find the problem in the KLM-367.

Thanks,
Mike

--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> Hi Mike,
> 
> Which position in the PSU have you retrieved this transistor from?
> 
> Cheers,
> Andy
> 
> 
> On 18/07/2011 22:45, "Mike" <mborish_2000@...> wrote:
> 
> >  
> >  
> >  
> >    
> > 
> > It might be 2SC2785...
> > 
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , "Mike"
> > <mborish_2000@> wrote:
> >> >
> >> > Has anybody crossed a 2SC2765 PolySix PSU transistor with a generic 2N*
> >> American Version?
> >> > 
> >> > I'm low on fuses and don't want to make a mistake or give this PSU more
> >> time than it deserves.
> >> >
> > 
> >  
> >    
> > 
> > 
> 
> 
> 
> [Non-text portions of this message have been removed]
>