Hello, I have a Korg microKorg with a KLM-2333 (KLM-2333C) PCB. The IC5 chip and the C46 capacitor have overheated. The capacitor shouldn't be a problem as It has only bulged so I can still identify it to replace it. The IC5 chip has burnt and I cannot identify it to replace it. Any help would be good. Cheers
Hi Mate, I have the exact same problem, casued by wrong adaptor being connected by accident, did you manage to find what the code is on the IC5 chip ?, I can see NSV, but there is another letter or number before it but cant make it out as that where its burnt.
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Check the mic and connections all through its input into the unit. I would check the cartridge of the mic for continuity for the reason that (I think but not 100% sure) on this model, I think there has to be sound at the mic or it does go silent in vocode mode. This is how it digitizes the mic and keys together. The played keys cannot put onto pitch the sound it is NOT picking up at the mic. I think there is a problem with the mic.
Sounds like a bad rotary encoder (the part that the "dial" is attached to"). If the circuit board or solder is not cracked in that area then that is likely the problem. You could find the part at mouser.com (about $1) and would need desolder the bad encoder and solder the new one in place or get the whole PCBA(printed circuit board assembly) from Korg.
It may not be the pedals as the fault can be oriented within the set. So I think you can open the back of the set and check for all connections to be tight , remove and refit.
If this wont solve it is not adviseable to check this higly intergrated PCB without a help. So consult the Korg service.
I can tell you what it is from first-hand experience. The audio in LED's coming on and going out means that a power supply putting out more than 9 volts DC was used...or the wrong polarity. Korg sells a repair manual for about $12 but they ultimately need a whole new circuit board. If the wrong polarity supply was used, then maybe only a diode was damaged. This would be a cheap fix. But more than likely it knocked out one of the large surface mount IC's that us techs don't even dare to replace. Korg charges around $280 for a new circuit board. A used working microKorg sells for this much.
Honestly, I would stay away from Korg products and many others. Many companies are now using surface mount components which are cheaper and harder to fix. Moog synths are expensive but they are completely fixable(and are built to last). If Korg would install a $0.25 voltage regulator on the input of the DC jacks, the unit would be saved. I think this pretty much sums up the build quality. This is probably not what you wanted to hear but is how it is unfortunately.
A diode or two could need replaced. I can't find a schematic. A microkorg would not be a fun project to take on yourself. Check this page and put your zip code in and check for a repair center (if you are in the US..I don't know if there is a repair center in Japan.