Hi Florian

Happy to report that my new SSM2044 arrived from vintage planet in the
Netherlands in record time. Popped it in and all is well. The synth
sounds "new". Really happy.

Thanks heaps for your research and advice, much appreciated!!

Another MP4 lives to squelch another day....

Sime

--- In korg_mono-poly@yahoogroups.com , Florian Anwander
<fanwander@...> wrote:

>
> Hi Simon
>
>
>
> > when I play keys, I can hear at very low level noise like the "gate"
> > opening.
> > The VCA envelope controls shape the envelope of this low level noise.
> if you turn all four parameters of the VCA-Envelope fully
> counter-clockwise. Playing a key you should hear a klick. -> if yes ->
> VCA is good and the output socket is good.
>
> Then set
> VCA-Envelope to A=0, D=0, S=10, R=10
> VCF-Envelope to A=0, D=0, S=0, R=0
> VCF Cutoff = 5, Resoncance = 10, Envelope amount = 10(+5)
> press a key several times, you should hear a fast resonance
> "Zongggg"-like sound.
> -> if not -> check the VCF-cutoff-modulation input socket. -> many

other

> problems tooo... ;-/ (see below)
> -> if yes -> turn the cutoff frequency fully clockwise and turn up

noise

> volume: do you hear noise
> If no ->
> If you are keen enough to open up the monopoly (ATTENTION: live
> endangering electric power inside!) set the keyboard to hold, press

four

> notes (or unisono) and check the noise and VCOs signal at pin 1 of
> connector 14 (the connector is at the right hand side of the VCO-pcb
> between the volumes of VCO1 and VCO2). If you do not have an
> socilloscope, the connect the output with an mixer and use the tip of
> another cable, connected to the same mixer as signal search (don't turn
> up the volume too loud, the signals might kill your
> tweeters/headphones/ears).
>
> If there is still nothing to hear I assume that the powersupply is
> defect. If there is something to hear, either the cable between VCO pcb
> and VCF pcb is broken, or the VCF chip SSM2044 is gone. Sometimes the
> 2044 is socketed, then you might check whether the chip is seated ok in
> the socket. But this requires unmounting the pcb from the frontpanel,
> which is not much fun.
>
> Florian
>