Vintage Synth Repair

Hi, I'm new to the group. This is a common problem. There's a relay
that gets dirty in there. Find the relay in the middle somewhere of
the board as I recall though I might be wrong on that....but anyway
there's only one relay I think...carefully remove the top (usually by
whacking off one of the plastic sections near the bottom so that you
don't have to hold two of them out at once..) and then spray deoxit on
the contacts and work them a bunch or use very fine abrasive between
them if necessary. -Bob Weigel /Sound Doctorin'

PS check out my web site at http://www.imt.net/~sounddoctorin and the
global synth section has tons of hints!
--- In vintagesynthrepair@yahoogroups.com, "letcista"
pereira@...> wrote:
>
> Hi group:
> I dealing with a problem with my Roland MKS-20.
> When I play hard on the master keyboard, the audio outputs (balanced,
> unbanlaced and phones) on the MKS-20 becomes distorted.
> The distortion seems to be greater when Chorus LFO it's at its peak,
> but even with the Chorus section bypassed distortion stays.
> At low MIDI velocities (playing softly on the keyboard) audio it's
> clean.
> Any help will be appreciated.
> Also a service manual for the MKS-20 in pdf format, will be welcomed.
> Best regards.
> José
> Portugal
>

Hi, I'm new to the group. This is a common problem. There's a relay
that gets dirty in there. Find the relay in the middle somewhere of
the board as I recall though I might be wrong on that....but anyway
there's only one relay I think...carefully remove the top (usually by
whacking off one of the plastic sections near the bottom so that you
don't have to hold two of them out at once..) and then spray deoxit on
the contacts and work them a bunch or use very fine abrasive between
them if necessary. -Bob Weigel /Sound Doctorin'

PS check out my web site at http://www.imt.net/~sounddoctorin and the
global synth section has tons of hints!
--- In vintagesynthrepair@yahoogroups.com, "letcista"
pereira@...> wrote:
>
> Hi group:
> I dealing with a problem with my Roland MKS-20.
> When I play hard on the master keyboard, the audio outputs (balanced,
> unbanlaced and phones) on the MKS-20 becomes distorted.
> The distortion seems to be greater when Chorus LFO it's at its peak,
> but even with the Chorus section bypassed distortion stays.
> At low MIDI velocities (playing softly on the keyboard) audio it's
> clean.
> Any help will be appreciated.
> Also a service manual for the MKS-20 in pdf format, will be welcomed.
> Best regards.
> José
> Portugal
>;