>Some question come to my mind now (I might have asked them before):
>How does the portamento for VCO4 behave if you put the Synth to >Unisono mode

Only for VCO4: In all mono modes, Chord and Unison, portamento is set to 0:

pressing C: no portamento
pressing C again after few seconds: no portamento
pressing C again after few seconds: no portamento
pressing E: portamento appears
pressing E: no portamento
pressing C again after few seconds: no portamento
pressing C again after few seconds: no portamento
pressing G: portamento appears
pressing G: no portamento

Only for VCO4: In all mono modes, Chord and Unison, portamento is set to MAX:

Same behavior as above

>Does the portamento happen also with switching the octave switch of >VCO4

It has exactly the same behavior at all positions of octave and waveform switches, whatever is selected from X-MOD, S&X or SYNC switch.
If there is a combination that I should check, such as for instance SYNC on, Unison Mono, Portamento at full etc… please let me know.

Currently I have closed the case of Monopoly so I cannot answer on your following questions:

a. Does C411 look different from C311,C211,and C111
b. Can you measure the voltage on the KLM354 at Connector 12 pin4 and then play octave jumps on the keyboard.
c. And then measure the voltage at the connection of R502 and IC10, while making octave jumps.

>My suspicion is that the previous owner modified the behavior of >VCO4 by intention. To my opinion this is confirmed by the fact, that >the VCO4 was detuned to exactly 4 notes above (which can make sense >for X-Mod sounds). So maybe we should not look for a faulty part, >but for signs of modifications.

Yes, you are right; it is exactly as you said.

Please download the following file and check it's pictures, when it was open, so you may be able to recognize the possible modification.

This is the link with the ZIP file:

http://www.2shared.com/fadmin/26610218/4b21bac3/monopoly.zip.html

Then please let me know what else I should check.

Thank you

--- In korg_mono-poly@yahoogroups.com , Florian Anwander <fanwander@...> wrote:
>
> Hello
>
> > So, in order to solve the issue with the Portamento on VCO4, I have
> > to take it and go to the electronic shop, to replace this chip which
> > is located under the capacitors (extra work has to be done).
> Some question come to my mind now (I might have asked them before):
> How does the portamento for VCO4 behave if you put the Synth to Unisono
> mode
> Does the portamento happen also with switching the octave switch of VCO4
> Does C411 look different from C311,C211,and C111
> Can you measure the voltage on the KLM354 at Connector 12 pin4 and then
> play octave jumps on the keyboard.
> And then measure the voltage at the connection of R502 and IC10, while
> making octave jumps.
>
> My suspicion is that the previous owner modified the behaviour of VCO4
> by intention. To my opinion this is confirmed by the fact, that the VCO4
> was detuned to exactly 4 notes above (which can make sense for X-Mod
> sounds). So maybe we should not look for a faulty part, but for signs of
> modofications.
>
> > Finally, I noticed that when I turn on my Monopoly, some times (not
> > all, a random note is playing without any key pressure. I have to
> > tell you that about 2 weeks ago, I opened the keyboard and replaced
> > some rubbers with new ones and cleaned the others with a soft
> > alcohol. Strange
> This might happen, if the spring of a key is not right in place and the
> key touches the button.
>
>
> Florian
>