K5synth

test for blown fuses in supply then test for ripple no load test of psu. that
would be the first thing to check once you have a healthy supply then move onto
other parts 90% of the time its failing psu filter caps after the rectifier

> On 28 September 2016 at 16:30 "Alejandro Caceres accaceres@gmail.com
> [k5synth]" <k5synth@yahoogroups.com> wrote:
> 
>      
> 
>      
> 
>     If all Daniel suggested fails, try checking the reset circuit, I posted a
> sort of guide a while ago. Those reset ICs seem to fail from time to time,
> specially if the you have a dodgy PSU (e.g. unstable Vcc due to bad supply
> caps).
> 
>     PS before any major repairs, try everything Daniel mentioned, as your
> problem is likely to be somewhere there.
> 
>     Good luck!
> 
>     On 28 September 2016 at 12:19, Daniel Forró danforcz@...
> mailto:danforcz@... [k5synth] <k5synth@...m
> mailto:k5synth@yahoogroups.com > wrote:
> 
>         > >          
> > 
> >         - power cable
> >         - fuse inside
> >         - power supply - el. caps, power regulators - check output voltages
> >         - transformer
> >         - lose connector - reseat
> >         - dirty or oxidized connector - c lean & reseat
> >         - damaged OS in Eprom
> >         - reseat all IC's in sockets
> >         - dead backup battery - replace it
> >         - garbage in RAM - send good data by MIDI, factory data for example
> >         here:
> > 
> >         http://www.kawaius.com/Downloads/download_archive-2.html
> > http://www.kawaius.com/Downloads/download_archive-2.html
> > 
> >         - lot of other reasons...
> > 
> >         Daniel Forro
> > 
> >         On Sep 28, 2016, at 11:44 PM, somethingkillingyou@...
> > mailto:somethingkillingyou@... [k5synth]
> >         wrote:
> >         > ...turned on my K5, and just as I mentioned in the title, no sound
> >         > and a blank display! yesterday it was fine.
> >         >
> >         > tried to power on and off but nothing changed, except for one
> >         > single
> >         > time, when the display showed some garbage, then nothing... any
> >         > hint? what could be?
> >         >
> >         > Fabio
> >         >
> > 
> > 
> >          
> > 
> >     > 
> 
>      
> 
>     
> 


 

>