Vintage Synth Repair

--- In vintagesynthrepair@yahoogroups.com, "eons" <laser@...> wrote:
>
> Hi,
> 
> I have this Technics for repair it power's up alright.
> All buttons work but no sound comes out from the tones/patches or rhythm section.
> 
> The LCD display also works alright.
> I saw internal battery inside that checked ok.
> 
> A bassy reverberating wave sound is continuously heard coming from the speakers and it wouldn't go away.
> 
> Any suggestions please/ ideas of what to check.
> All supplies seem to be ok although I do not have a schematic/sercive manual.
> 
> Thanks very much in advance.
> 
> Regards,
> eons
>
Bassy sound...Sounds like power supply hum.
Thats where i'd look first. Discolored or swollen parts