In my last job as a music tech in a college going back about 10 years ago I had to service a Korg MS2000 which is similar with the main CPU and a DSP. The unit was much worse than yours and would produce nasty noisy distorted sounds when played and many of the sound programs and controls wouldnt work. I spent some time trying to figure out what was wrong and decided the DSP chip was faulty. I went on internet to look for another DSP chip and found a seller in America so I bought it. When it arrived I decided my college supplied soldering tools wernt up to the job of removing the old chip and resoldering the new chip so I found a local electronics servicing company who took the board and DSP chip and did the work for me for a good price. When I got the board back I installed it in to the synth again, connected it all up and powered it up and it worked perfectly again!
@DubiousEngineering2 жыл бұрын
One day I may get myself a hot air station and replace the DSP... I was really struggling to track down the problem! ... thanks for the tip! Howard
@SyntheticWhispers-yu3dn10 ай бұрын
Great video. Now I know where to begin. The MK I have has an issue with the Vocoder. The 1/4 cable in produces no sound, but the VU meter shows a signal. And the 1/8 inch in cuts in and out. To me this seems like just a loose connection somewhere but wonder if you have ever run into a similar issue.
@StellaWembley3 жыл бұрын
I am going to open the front panel following your instructions. I don't have a wrench and Allen key neighter lol, now I understand why I couldn't remove the knobs . I hope I will be able to fix the 2 buttons, which seem to be dead. Thanks!!
@DubiousEngineering3 жыл бұрын
Good luck Stella!
@lactobacillusprime3 жыл бұрын
Oh these are gold. Shame about the sick vocoder and dsp. :(
@DubiousEngineering3 жыл бұрын
Yeah it would be great to get it back up and working again... but there are limits on equipment and how much time and energy we put into these projects!! Have a great weekend!!
@Man-in-da-shed3 жыл бұрын
Proper head bangin stuff in more ways than one, I did enjoy the circuit board tour, and not one hammer used at all
@DubiousEngineering3 жыл бұрын
Morning Ian!! :-). No synthesisers were harmed in the making of this video... but trust me, after I found I couldn’t fix it, I was soooo tempted to take a hammer to it!!!! Hope you’re well mate!! For those that enjoy things being taken apart, pop over to visit Ian’s scrapping channel... where he sometimes uses a hammer to smash stuff up :-)
@wellokayyes12662 ай бұрын
I smashed the like at the intro with that sound effect lol :)
@DubiousEngineering2 ай бұрын
Thanks man!!! 😊🙏
@SmashAtoms3 жыл бұрын
You sound like the Smart Gremlin from Gremlins 2, and I love it. I got a Microkorg from my job for $100, but the cutoff knob is broken. Still not a bad deal, and this video helped me figure out how to get the board out. Cheers!
@DubiousEngineering3 жыл бұрын
Really happy to have helped!! :-) I love fixing things!!
@StofffeGbg3 жыл бұрын
Great stuff! More synths on the channel Howard! :)
@DubiousEngineering3 жыл бұрын
Owwwh Chris, it's always great to have a noodle around on a keyboard!! I'm a bit partial to synths... and music, probably guitar a little bit more... that said, there are so many other things that im passionate about and want to share with you ... dont worry, we will get back to some dubious projects in the near future... probably a bit of jet engine - maybe some welding up of somthing silly that annoys the wife... :-)
@techman24713 жыл бұрын
I am looking at the schematic for this product line. I didn't see any easy way to reprogram the DSP. There seems to be no debugging header of any kind. However, you could see if someone could loan you a Segger JTAG or equivalent programmer along with attaching a header to pins 138 -141 of the DSP. This would allow some access to the chip.
@DubiousEngineering3 жыл бұрын
I've been in touch with a couple of people now, so lets see what happens and if they engage with me. If not, I'll just enjoy it for what it is!! Thanks kindly for taking time out to look up the CCT - i'm sure you can now see why I can't easily fix it :-)
@mastaboog749 Жыл бұрын
i got one from a trash find, sadly the power supply and replacement doesn't work. So i know it's the DC input jack. I ordered a new one and i'm hoping I can figure out how to desolder the old one so I can put in a new one. Tho maybe I'll try a spray of deoxit inside, idk why i didn't. I know the synth works because i put some batteries in it. Tho all the knobs are missing now so have to replace those also.
@DubiousEngineering Жыл бұрын
3D print knobs ! Enjoy!
@dontfearthenoise9 ай бұрын
I have a weird issue with my microkorg. The AMP EG position of the edit select knob doesn't seem to connect. If i've selected the previous notch, (the amp section) I can obviously adjust the level of the microkorg with the 1st top knob. If I then go down to the AMP EG section where that same knob should control the attack envelope, instead it thinks its still in the AMP section and still controls the overall volume. If i go down to LFO1 and then "up" the amp eg section, the knobs are still controlling the LFO1 parameters. Its like the microkorg isn't recognizing the AMP EG notch at all when the switch is in that position, but instead either the position before it or after it depending on what was last selected. Is this most likely a dirty contact? I plan on tearing mine down for a good cleaning as well, but I was wondering if anyone else has seen this before.
@DubiousEngineering9 ай бұрын
I’ve not seen this before, good luck, I hope people watching this can help you!
@andrewblawson8 ай бұрын
I'm trying to figure out what is wrong with mine. It turns on, all the knobs and keys appear to be functioning, but only static occasionally comes out, would you have a guess as to what is going wrong inside, or know how to check?
@DubiousEngineering8 ай бұрын
I'd get an oscilloscope on the audio output side of the DSP - before the main amplifier to see...
@LAREZ.MUSICA10 ай бұрын
Thanks! This video is super helpful! I bought a used Microkorg that apparently was plugged with an AC adaptor. It turns on perfectly, but the issue is that I get almost no sound from neither outputs. The outputs have very low volume. What could it be? Thanks mate!
@DubiousEngineering10 ай бұрын
Almost no sound? - Perhpaps the audio output amplifiers are blown... can you solder and do you have an oscilloscope?
@LAREZ.MUSICA10 ай бұрын
Thanks for getting back at me! I can solder it, how does the audio output amplifiers look like? Where are they located? Thanks mate! @@DubiousEngineering
@mattbainton2 жыл бұрын
I’ve been given an old microkorg that has a few keys that don’t trigger. Any advice on where to start troubleshooting?
@DubiousEngineering2 жыл бұрын
Youtch! ... get a multimeter over the contacts to see if the key is making contact... that'll keep you stumped for a while :-) 😀... if it doesn't make contact, take the keyboard apart.
@sssstephen38203 жыл бұрын
I recently replaced all 8 program number buttons that had gone bad on my microkorg. Put it all back together and everything works great. ONE PROBLEM: Now the cap that goes on top of my volume knob comes off very easily. Any theories as to why it doesnt stay on as tight anymore?
@DubiousEngineering3 жыл бұрын
Solution - glue :-)
@GrootsieTheDog2 жыл бұрын
I was lucky to find a super rare Vintage Gold MicroKorg special edition. It was mint except someone spilled soda or beer on it and the buttons were sticky. I took off the top fist layer and cleaned it up. The only issue is that the right octave button still sticks sometimes in the humid summer. But only in the summer when it’s humid. In the winter when it’s dry it’s just fine. My question - is there a spray I can put in there without taking it apart that can break down or keep the sugary substance from being sticky when the weather gets warm and humid again, right now it works great but I know when the summer comes back it will stick!
@DubiousEngineering2 жыл бұрын
Suggest you try “switch cleaning lubricant “ first and then follow up with a little WD40. Love the old korgs !!!
@wolfgangwiesinger950210 ай бұрын
Hi everyone, is there a chance to repair Midi in (it is not working), i see at 7:00 it is direct on the board ?
@DubiousEngineering10 ай бұрын
Check the soldering around the din connectors first.
@wolfgangwiesinger950210 ай бұрын
@@DubiousEngineering Ok, thank you
@wolfgangwiesinger950210 ай бұрын
@@DubiousEngineering ok, i dismantled the engine and was able to follow electrical signal from a connected 5 pin midi cable to the backside of the board. After reset midi worked for some seconds now its dead again.
@ScudoCamper3 жыл бұрын
a thats wicked mate.
@DubiousEngineering3 жыл бұрын
You need one installed in your van :-).
@SanplerVarondaro2 жыл бұрын
excelente
@DubiousEngineering2 жыл бұрын
Thank you!!
@lecheng-synth3 жыл бұрын
Can I add a reverb circuit module before the output?
@DubiousEngineering3 жыл бұрын
The output is through a couple of amp chips... I’m sure you could cut the tracks and inject a secondary cct
@matrizxxii3 жыл бұрын
mas fasil usar unas bocinas de pc o un amplificador fabricado por uno y listo
@DubiousEngineering2 жыл бұрын
Good idea! - Thank you!
@patrickstarnes23553 жыл бұрын
Ahhhh shame you couldn't fix it. After all that foreplay! Try some WD40! Who knows.
@DubiousEngineering3 жыл бұрын
Hahah - You little @&%$£.... Welcome to the life of Dubiousness... If it's broke, fix it with WD40 :-) or Duct Tape :-)
@DesmondsDonders3 жыл бұрын
Shame about the DSP. There used to be KORGs everywhere.
@DubiousEngineering3 жыл бұрын
Its a real shame, I cant fix it as I dont have the original code or a way of uploading it to the PCB. Never mind, I'll just have to enjoy it as it is in its analogue format!! Which is quite nice!! Weather here is terrible, and certainly not conducive to travelling... hope your staying dry in Scotland mate :-)
@DesmondsDonders3 жыл бұрын
@@DubiousEngineering Perhaps a note to Motorola. thy may have a chip lying around. Weather dry but windy up here.
@JackBealeGuitar3 жыл бұрын
Funky stuff
@DubiousEngineering3 жыл бұрын
Hey Jack - Ready for lockdown v2.0 :-) Thanks for popping on mate!! - Do me another funky guitar riff when your dunk one day - make it easy, send it on messenger - just 20 seconds and i'll nick it for a tune again - love your licks (oooh... that sounds wrong!!)
@DubiousEngineering3 жыл бұрын
You can just make a video in front of your speaker and i'll plug my phone into my sampler - quick and dirty...
@JackBealeGuitar3 жыл бұрын
@@DubiousEngineering I can send you dry stems with no amp models or any fink if you want
@DubiousEngineering3 жыл бұрын
@@JackBealeGuitar - Jack, If a moment of inspiration hits you one day... and you think to yourself... that was cool and funky, stuff me a video (actually dont care about the video just want the audio) perhaps its possible to do that on "voice recorder" if your using iphone - i think it mp3s it... either way, i dont care, just stuff me a little noodle one day if you think of it and you have a moment. I love to mess with it , bend it and make it into something different! Max 30 seconds :-) No pressure!
@JackBealeGuitar3 жыл бұрын
@@DubiousEngineering I don't have an iphone, but I do have a great recording interface and a PC with cakewalk :)
@therushden3 жыл бұрын
send it to markusfuller.
@DubiousEngineering3 жыл бұрын
Interested to know more... is he on twitter? How do I contact him?
@therushden3 жыл бұрын
@@DubiousEngineering i just follow him on youtube, he's a whizz with anything synth.
@DubiousEngineering3 жыл бұрын
Boom - Thank you!! - I have subscribed and send him a personal message - lets see if he is kind enough and has time to get back to me!! Thanks!!!
@hiii15483 жыл бұрын
I can't get any sound out of it. Ive tried EVERYTHING. 😥 PLEASE HELP.
@DubiousEngineering3 жыл бұрын
what happens when you plug the adapter in? do lights come on?