Vintage Synth Repair

My Rolans RS-09 makes a high pitched wine like a TV (well maybe not as
high as that but similar) when not being played..it's not very loud
and it's still useable but it's very annoying. I guess it's about as
loud as  the hiss. It's sounds like a high pitched organ tone stuck
on. It's not supposed to do this right? Any info on fixing it?
schematics would be nice :o)

Thanks, Phil.

Is the sound coming through the cable (electronically), or directly off 
the unit (physical sound)?
If it comes right off the unit, it could be a component in the power 
supply that should be glued down, but is occilating.

> My Rolans RS-09 makes a high pitched wine like a TV (well maybe not as
> high as that but similar) when not being played..it's not very loud
> and it's still useable but it's very annoying. I guess it's about as
> loud as  the hiss. It's sounds like a high pitched organ tone stuck
> on. It's not supposed to do this right? Any info on fixing it?


tw.  :)

"Those great moments come when musicians are playing together..."
(Bob Moog)

No its a sound through the speakers...it reacts to the
master tune like a normal sound..I say it sounds like
a high pitched organ tone but I tried the Organ Raw
out/sig jack and the noise disappears..so i doubt it's
in that circuit.


--- Terje Winther <terjewi@...> wrote:

> Is the sound coming through the cable
> (electronically), or directly off 
> the unit (physical sound)?
> If it comes right off the unit, it could be a
> component in the power 
> supply that should be glued down, but is occilating.
> 
> > My Rolans RS-09 makes a high pitched wine like a
> TV (well maybe not as
> > high as that but similar) when not being
> played..it's not very loud
> > and it's still useable but it's very annoying. I
> guess it's about as
> > loud as  the hiss. It's sounds like a high pitched
> organ tone stuck
> > on. It's not supposed to do this right? Any info
> on fixing it?
> 
> 
> tw.  :)
> 
> "Those great moments come when musicians are playing
> together..."
> (Bob Moog)
> 
> 



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is this noise in tune with the other sounds the keyboard makes? you
say it is affected by the master volume, I think, but does it alter in
pitch with the tuning control? it could be leakage from the master
oscillator through a VCA that's gone bad, or it could be chorus-clock.
does the chorus effect still work properly? (one of my favourite
things on the rs09 is to put external audio through this)
does yours have the huge rocker switches or the LED buttons? could be
the electronics that scan these switches if it's the later model. any
case, check the power supply for failed components that could be
allowing this kind of crosstalk (parasitic oscillation) onto the audio
path. it's a linear power supply in these keyboards (thank heavens) so
it's not likely to be the power supply itself...
good luck, & don't forget to let us know what turns up.

duncan.

yeh its in tune with the sound and moves with tuning
knob..it is the last revision with the colored knobs

Cheers, phil.

--- duncan <ferrograph@...> wrote:

> is this noise in tune with the other sounds the
> keyboard makes? you
> say it is affected by the master volume, I think,
> but does it alter in
> pitch with the tuning control? it could be leakage
> from the master
> oscillator through a VCA that's gone bad, or it
> could be chorus-clock.
> does the chorus effect still work properly? (one of
> my favourite
> things on the rs09 is to put external audio through
> this)
> does yours have the huge rocker switches or the LED
> buttons? could be
> the electronics that scan these switches if it's the
> later model. any
> case, check the power supply for failed components
> that could be
> allowing this kind of crosstalk (parasitic
> oscillation) onto the audio
> path. it's a linear power supply in these keyboards
> (thank heavens) so
> it's not likely to be the power supply itself...
> good luck, & don't forget to let us know what turns
> up.
> 
> duncan.
> 
> 



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>>yeh its in tune with the sound and moves with tuning
> knob..<<

did it start suddenly or gradually? could give a clue as to what
component has failed.... is the noise related to one pitch or does it
seem to be the whole scale sounding at once? 

but without schemos, we're poking around in the dark here. anyone know
what the rs09 architecture is? seems to me to be a twelve-osc
top-divider type thing.... anyone got any thoughts on this?

duncan.

It's always been there..it sound related to one note
not a whole scale.

I havent been able to find any schems for it.

Thanks, Phil.


--- duncan <ferrograph@...> wrote:

> >>yeh its in tune with the sound and moves with
> tuning
> > knob..<<
> 
> did it start suddenly or gradually? could give a
> clue as to what
> component has failed.... is the noise related to one
> pitch or does it
> seem to be the whole scale sounding at once? 
> 
> but without schemos, we're poking around in the dark
> here. anyone know
> what the rs09 architecture is? seems to me to be a
> twelve-osc
> top-divider type thing.... anyone got any thoughts
> on this?
> 
> duncan. 
> 
> 



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