Korg Mono/Poly

Ok, I spoke too soon. It works, but not correctly now - something is 
wrong with the VCA EG or something else, when I press a key I only 
get a sound when I let go of the key, not when I press it down. 

Turning the ADSR to 0 on the VCA EG then playing a key only gives a 
sound when I let go of the key. When I turn the attack to 2 and press 
a key, it still only plays when I let go but fades in and cuts out. 
If I turn the sustain knob up, the note rings on endlessly, the 
release knob doesn't appear to change anything. 

Basically, I'm only getting sound when I let go of a key, what is 
that a sign of? Just when I thought I was in the clear!



--- In korg_mono-poly@yahoogroups.com, "hoggybogger" 
<hoggybogger@...> wrote:
>
> It works now! Here's what happened tonight, I changed the volume 
pot 
> to a new one (I had ordered a replacement a few years ago, never 
got 
> around to installing it) and it didn't fix the problem.
> 
> Then it occurred to me after messing with this for a bit, that it 
> might be the MIDIJACK I installed on this last year - sure enough, 
> one of the wires had come disconnected. Reconnecting it solved 
> everything! 
> 
> So there was nothing wrong with my Mono/Poly, only the wiring for 
> MIDIJACK kit I had put in. This whole ordeal at the very least got 
me 
> to change the potentiometer, and learn a bit of troubleshooting. 
> Thanks for your help Florian, I appreciate it. 
> 
> I also decided to purchase the Korg Legacy 2007 collection, since I 
> don't own any official emulation synths. It will be nice to have a 
> backup if one of these go down again. It just kind of makes sense 
to 
> perform with a controller and laptop, this synth belongs in the 
> studio, less gigging with it means less repairs. I just hope the 
> software version sounds pretty good, I imagine it does!
> 
> Working with the Mono/Poly and Polsix has been taxing because of 
> frequent repairs (and I cannot afford to ship them out for 
> professional work) but still very gratifying. The only thing that 
> bothers me about the Polysix is the key contacts, I've tried 
multiple 
> repair techniques without a solid fix. I tried a few methods, one 
> recently which worked great for a month or two, and now a number of 
> the keys are back to not playing, or intermittent. I also used the 
MG 
> Electronics keypad repair kit, which worked great on my Mono/Poly, 
> still working 10 years later with no key dropouts, but the Polysix 
> for some reason has always had a problem. 
> 
> Anyways, I'm so glad it's working again. Back to normal. 
> 
> Rich
> 
> 
> 
> --- In korg_mono-poly@yahoogroups.com, "hoggybogger" 
> <hoggybogger@> wrote:
> >
> > Thanks for the reply Florian - I am wondering where to measure on 
> the 
> > low/mid/high switch, there are eight points - do I just choose 
any 
> > one of the four pairs and do them across? 
> > 
> > I'm confused on how to measure the VCA out and VCF out 
testpoints, 
> > would I be looking for some kind of voltage reading, or is that 
for 
> > placing the output to an amp like an audio cable to test for 
sound?
> > 
> > Thanks again for your help, I will have a chance to test some 
> things 
> > out when I get out of work in around five hours.
> > 
> > Rich
> > 
> > --- In korg_mono-poly@yahoogroups.com, Florian Anwander 
> > <fanwander@> wrote:
> > >
> > > Hi
> > > 
> > > hoggybogger schrieb:
> > > > The only sound I seem to be able to get out of this, with it 
> > > > completely cranked up, is when the noise potentiometer is 
> turned 
> > up, 
> > > > and the resonance and cutoff turned up. I can get a very 
faint 
> > hissy 
> > > > noise when I'm playing, and if I turn the resonance and 
cutoff 
> > while 
> > > > playing it changes the noise like you'd expect it to. Just 
> almost 
> > > > completely inaudible, this was all the way up and then fed 
into 
> a 
> > > > mixer with the gain all the way up.
> > > This is good. It says the SSM2044 is not broken.
> > > 
> > > > I took the knobs off and backed the nuts off the pots, and 
took 
> > the 
> > > > CN16 connector off and measured pin 3, but I didn't seem to 
be 
> > > > getting anything. Should I be measuring it from the wire 
> harness 
> > that 
> > > > goes into it? That's where I measured it. I could be doing 
> > something
> > > > wrong. I did not check the CN2 pin 3, I was having difficulty 
> > finding 
> > > > it and had to quickly come up with an alternate solution for 
> > > > performing this wednesday night. 
> > > 
> > > Basically I still think it is something not very troublesome; 
> maybe 
> > the 
> > > low/mid/high-Levelswitch or the volume potentiometer is dirty 
or 
> > (in 
> > > worst case) broken. But both you could temporarily heal by 
> bridging 
> > them.
> > > 
> > > You may try to measure (or listen with an cable) to the 
following 
> > > testpoints:
> > > 
> > 
> 
http://fa.utfs.org/diy/korg_monopoly/mp_13_klm_353_layout_testpoints.j
> > pg
> > > 
> > 
> 
http://fa.utfs.org/diy/korg_monopoly/mp_14_klm_355_layout_testpoints.j
> > pg
> > > These show the pcbs from the solderside, so you don't have to 
> > remove the 
> > > pcbs from the front. The testpoints are marked yellow.
> > > 
> > > 
> > > Florian
> > >
> >
>