New Key Contacts Work Great!
2016-03-01 by chipaudette@yahoo.com
Hi All, I had some dead keys on my Mono/Poly. Years ago, I tried the CaiKote paint-on stuff and it worked great for a couple of years. After a while, though,
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Re: Mono/Poly with Bad Keyboard
2016-01-10 by synthmans@gmail.com
I used an old Roland teaching piano keyboard that had the right diode/key matrix, just had to chop off the extra keys to fit it into the box....
Mono/Poly with Bad Keyboard
2016-01-09 by wny_synth@yahoo.com
All, I have a Mono/Poly where someone attempted a really bad repair of the keyboard ruining the printed circuit board in the process. I need a replacement
Re: [korg_mono-poly] Re: Filter Resonance Not Working
2015-12-08 by Florian Anwander
Hello The VCF adjustment always can be done by ear. I think you will only have to adjust VR19 with the voltmeter, like described in the adjustment instructions
Re: Filter Resonance Not Working
2015-12-08 by voltagegrove@yahoo.com
Just reviewed the calibration manual... I do not own an Oscilloscope. Is there any chance that I could manage without one? By using my DVM and my ears? Is
Re: Filter Resonance Not Working
2015-12-08 by synthmans@gmail.com
Luckily they re still relatively inexpensive!
Re: Filter Resonance Not Working
2015-12-08 by voltagegrove@yahoo.com
Hey guys, just wanted to report that popping in the new SSM2044 was a complete success! What a relief! Only problem now is that I have to work through the
Re: [korg_mono-poly] Basic Electronics Pointers - Yes Im a totally ashamed newb...
2015-12-05 by Niklas Ehrlin
Start by measuring on stuff you know the expected voltage. For example batteries or low voltage sources, so that you get to know your instrument. Much easier
Basic Electronics Pointers - Yes Im a totally ashamed newb...
2015-12-05 by voltagegrove@yahoo.com
It seems as though when I am attempting to trace and measure voltage within circuits. I keep getting the same voltage at every point in the circuit... Please
Re: Filter Resonance Not Working
2015-12-04 by voltagegrove@yahoo.com
So it seems as though I can trace the voltage all the way to the chip. Question though... It does not seem as though VR3 nor VR4 has any effect whatsoever. I
Re: [korg_mono-poly] Re: Filter Resonance Not Working
2015-12-03 by Florian Anwander
Hello ... Yes. That sounds reasonable.. ... No. Regards Florian
Re: [korg_mono-poly] Re: Filter Resonance Not Working
2015-12-03 by voltagegrove@yahoo.com
So I confirmed that it is indeed on the ground source. I was getting 1.7 volts. Which seems much more plausible. I measured each component and it does seem
Re: [korg_mono-poly] Re: Filter Resonance Not Working
2015-12-03 by voltagegrove@yahoo.com
Ok I will double check this. I definitely did have the black lead connected to the spot marked ground on the power supply board...
Re: [korg_mono-poly] Re: Filter Resonance Not Working
2015-12-03 by Florian Anwander
... That is correct. ... This sounds like your black lead is connected to the -12V supply. Not to the Ground. An easy to find ground is the groundwire at the
Re: Filter Resonance Not Working
2015-12-03 by voltagegrove@yahoo.com
so far I have been able to reseat the 2044, which did not have any effect. I have also tested the R2 resistor which is fine, although it seems to be a 4.7k
Re: [korg_mono-poly] Re: Filter Resonance Not Working
2015-12-03 by florian anwander
Hello ... Yes one of these is the actual event, that causes the joint to break, but the initial cause is some fault while soldering, when the synth has been
RE: [korg_mono-poly] Filter Resonance Not Working
2015-12-03 by <alanmdicker@yahoo.co.uk>
The pot for the filter res also control a VCA which counter acts the drop in audio level when the filters resonance increases. Sounds like the VCA is working
Re: Filter Resonance Not Working
2015-12-03 by voltagegrove@yahoo.com
Thanks for your reply. Much appreciated as it now is making sense. I will hopefully be able to dig in there tomorrow and will post my feedback. I decided to
Re: [korg_mono-poly] Re: Filter Resonance Not Working
2015-12-02 by Niklas Ehrlin
I have nothing to add, more than to say; What an absolutely wonderful answer, Florian! Short, precise and easy to follow. ... Niklas 2015-12-02 13:48 GMT+01:00
Re: [korg_mono-poly] Re: Filter Resonance Not Working
2015-12-02 by Florian Anwander
Hello ... The resonance potentiometer sends out a voltage, which controls the internal resonance circuit in the 2044 via VR3. But this voltage controls also
Re: Filter Resonance Not Working
2015-12-02 by voltagegrove@yahoo.com
Can I assume correctly that if the 2044 was bad then the rest of the filter would not be working correctly?
Filter Resonance Not Working
2015-12-02 by voltagegrove@yahoo.com
Hey guys, delighted to tell you that my Mono/Poly is full healthy! For the time being that is... All voices are stable and in tune. I had it powered on all day
Re: MP Tuning
2015-11-23 by Steve Wilson
Correction, the resistors are 475 ohm not 175 ohm.
RE: [korg_mono-poly] MP Tuning & Stability Problems
2015-11-23 by <alanmdicker@yahoo.co.uk>
It had been suggested before that a sure fire way of determining if the issue was with the 2033 was to swap it over with one of the others. An inexpensive and
MP Tuning & Stability Problems
2015-11-22 by voltagegrove@yahoo.com
hey all, I reach out once more to hopefully get some more information regarding my monopoly. The original problem of VCO4 not being able to tune properly has
Fw: new message
2015-10-25 by <i.scrites@no-log.org>
Hey! New message, please read i.scrites@no-log.org
Fw: new message
2015-10-25 by <i.scrites@no-log.org>
Hey! New message, please read i.scrites@no-log.org
Fw: new message
2015-10-25 by <i.scrites@no-log.org>
Hey! New message, please read i.scrites@no-log.org
Re: Signs
2015-10-05 by Steve Wilson
Also, the ssm2033 doesn t have a thermistor on it in the MP4, those are just metal film resistors. They aren t used for temperature compensation they are
Re: Signs
2015-10-05 by Steve Wilson
I will agree with you that trim pots are a good idea, but I will respectfully disagree about the electrolytic capacitors. I have seen electrolytics spilling
Re: Signs & Symptoms of a bad SSM2033
2015-10-05 by voltagegrove@yahoo.com
Hey thanks for your replies, I will be contacting my tech first thing tomorrow. I am assuming that it is not the SSM2033... VCO4 just doesn t seem to be
Re: [korg_mono-poly] Re: Signs
2015-10-04 by florian anwander
Am 04.10.2015 um 18:47 schrieb Steve Wilson ... To be honest: the most likely failure are the trimmers, they collect dirt and the center trace can corrode -
Re: Signs
2015-10-04 by Steve Wilson
It is possible for a bad chip to cause stability or tuning problems, however, it s far more likely that the external heating resistor is bad (or the transistor
Re: [korg_mono-poly] Signs & Symptoms of a bad SSM2033
2015-10-04 by Florian Anwander
There are no other known issues, than it won t play at all. Everything else can have a different cause than the 2033, so tuning or stability are no certain
Signs & Symptoms of a bad SSM2033
2015-10-03 by voltagegrove@yahoo.com
Hey All, I am inquiring for any information regarding the signs and symptoms of a bad SSM2033. Still trying to diagnose my MP and if anyone could lend just a
Re: Rubber Contact Strip Preservation
2015-09-21 by jw_dewdney@yahoo.com
or else use formula 303 aerospace protectant... though it s better to start using it when the rubber is newly manufactured - it s a fantastic proven product
Re: [korg_mono-poly] Rubber Contact Strip Preservation
2015-09-21 by Florian Anwander
... Simply get new ones: http://syntaur.com/Items/4350.html and http://syntaur.com/Items/4349.html Florian
Rubber Contact Strip Preservation
2015-09-21 by turboswami@gmail.com
Hello All, I recently opened up my Korg to do some routine cleaning of the key contacts, in preparation for an upcoming studio session. In addition to the
Re: SSM2033 Chips Available on ebay... Trustworthy?
2015-09-15 by Steve Wilson
I am the one selling those SSM2033s on eBay. I can guarantee that they are New old stock chips that I bought from Korg USA many years ago. So they are as real
Re: [korg_mono-poly] Re: Mono/Poly Tuning Problems - OSC4
2015-09-15 by Florian Anwander
Hello, to be honest. I think it does not make sense to talk about it, if we do not have a reliable technical description of the real facts. I don t want to
SSM2033 Chips Available on ebay... Trustworthy?
2015-09-15 by voltagegrove@yahoo.com
Hey all, in the spirit of having oscillator issues with my MP, I was searching for SSM2033 chips; which I thought was going to be a hopeless affair. To my
Re: Mono/Poly Tuning Problems - OSC4
2015-09-15 by voltagegrove@yahoo.com
Is there any chance that it could be one of the SSM2033 chips? The Oscillator functions beautifully minus the whole being unstable and drastically out of
Re: Mono/Poly Tuning Problems - OSC4
2015-09-14 by voltagegrove@yahoo.com
So I spoke to him briefly this morning. He of course knew of all the nuggets that you guys had sent. Apparently it is beyond basic calibration, he doesn t
RE: [korg_mono-poly] Mono/Poly Tuning Problems - OSC4
2015-09-14 by <alanmdicker@yahoo.co.uk>
If the voices are changing in pitch even after a warm up period then maybe also check the integrity of KLM 357 the heat compensation board. This can have a
Re: [korg_mono-poly] Mono/Poly Tuning Problems - OSC4
2015-09-14 by Anwander, Florian
Hello Jarrett Did your tech realign the powersupply and the Key-Assigner (=D/A converter)? This has to be done first. The order is important. See
Re: [korg_mono-poly] Mono/Poly Tuning Problems - OSC4
2015-09-14 by <kimouts@gmail.com>
Maybe you could contact Ko from modeless factory. He is ace in servicing them ;-) On Sep 14, 2015 6:27 AM, voltagegrove@yahoo.com [korg_mono-poly]
Re: Mono/Poly Tuning Problems - OSC4
2015-09-14 by voltagegrove@yahoo.com
And by what I meant by out of phase was seemingly a beating that was occurring between all OSC s. Detuning them on front panel would only get them close but
Mono/Poly Tuning Problems - OSC4
2015-09-14 by voltagegrove@yahoo.com
Hey Guys, So its a bit of a long story to give you all the details but here is the abridged version. I went to install the MidiPoly kit and there were many
Re: Power supply overheating
2015-09-14 by voltagegrove@yahoo.com
Hey i have this same issue. I have mine at a tech shop getting fitted with Midi and having the voltage converted to 120v. I will let you know as soon as I
Re: [korg_mono-poly] Re: Power supply overheating
2015-09-10 by freb101@yahoo.com
Hi, may I ask you what kind of power supply you have used? What are the specs?