Korg Mono/Poly

It's from the internal keyboard, nothing external plugged in. So 
frustrating. 



--- In korg_mono-poly@yahoogroups.com, Chase Smith <plus_321@...> 
wrote:
>
> From the internal keyboard or an external keyboard (CV/MIDI).
> 
> If it is from an external keyboard, then check the s-trig switch to 
make sure it is set on v-trig.  It sounds like it is getting a 
constant gate so it has something to do with the s-trig/v-trig 
conversion.
> 
> Chase
> 
> --- On Tue, 2/10/09, hoggybogger <hoggybogger@...> wrote:
> From: hoggybogger <hoggybogger@...>
> Subject: [korg_mono-poly] Re: No sound output from main out or from 
headphone out! FIXED!
> To: korg_mono-poly@yahoogroups.com
> Date: Tuesday, February 10, 2009, 9:20 PM
> 
> 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
> > > >
> > >
> >
> 
> 
> 
> 
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