I have a Korg C-15S Piano that i just recently changed the fuses to becasue it wasnt turning on. After I changed the fuses it turned on for a bit and was working great. Later when I tried turning it back on again, it didnt want to turn on anymore. I checked the fuses and they were ok. I replaced them and the piano turned on again but some of the keys had a sound distortion. I turned it off and back on again and it seemed to go away for a bit but then it came back. Then all of a sudden the piano didnt want to turn on anymore. Can anyone help me with this problem?

This is the help that the owner manual offers...completely useless.
However, it is likely that if your piano isn't turning on, either your connection is bust or your AC power adapter is broken. You can purchase a replacement relatively cheaply. https://www.thomann.de/gb/korg_netzteil_ka_320.htm

First things to check, power supply unit, is it the original or the one that has previously worked - if yes check the output voltage with a meter to ensure this is working.

When you plug this into the piano if you wobble the plug does the socket feel loose? You may even get a tempoary connection, if you do or it feels loose the socket needs repairing.

If this all checks out ok the next step is move inside the piano, you will need to know a bit about electronics to proceed to this step.

Report back and I may be able to help further.

You have probably activeated a split point. Do a reset next time you turn it on and see if that doesn't correct the problem.

Look in your manual or online for instructions on how to reboot or re-initialize your instrument. Normally it needs various specific buttons pressed when you turn the instrument on. This will reset the instrument to the factory settings and clear up most glitches, but you will lose any changes you've made, so it's always best to save your info periodically to an outside device.

i have korg pa 50 fd when i turn on the power on screen says korg pa 50 only thing work just piano that is it my menu all freez to download the floppy disk is any body has any idea thanks
plz help me out

It looks like the Korg c-15s has a internally mounted speaker and so I will assume that the speaker and amplifier are part of the piano base. It sounds like either the speaker is blown (crackling sounds heard as deformed voice coil scrapes the magnet structure) or the audio amplifier is distorting the audio.

Connect the piano's output to an external amplifier and speaker to properly identify problem.

When was the last time you changed the batteries? You may have gotten a pack of expired batteries the last time you replaced them. I suggest changing batteries.Jimmy

There probably is a cable or connection inside that is loose... The keys are scanned as a matrix so some connections are in common...

HOWEVER: Since you have had it several days DO NOT delay, call for warranty service. This is not a DIY repair unless you are adept and comfortable with electronics.

I have a Korg C-15s and also experiencing loud crackling sounds when I turn it on. The problems seems to be either the sliding volume control or the amplifier itself. Honestly though, I believe the issue is the volume control. I opened my piano to get a closer look and attempted to clean the contacts on the volume. Unfortunately after cleaning the contacts, the crackling sounds became somewhat worse. After I turn the piano on, the volume control is generally rendered useless......volume set to low volume and the noise is quite loud and other times the volume control is set high and get very low volume crackling noise. No real consistency. The noise does diminish after a few minutes but so does the piano sounds to an inaudible level. There were a couple of instances where I turned it on and surprising enough, no no noise and perfect sound. For these reasons I believe the issue is within the volume control and not so much the amplifier. I have an electronics background and noticed that the volume control is very unique in design and is not something that can be substituted with another volume control from other sources.

My recommendation is to check the sound quality of the audio from the RCA L/R audio outs on rear of the piano by connecting to a stereo receiver. If it sounds fine you're in luck. If the crackling sound does not diminish after a few minutes like mine does, I would suggest disconnecting the internal speakers and using the audio out only. You can connect a pair of studio monitors or high quality computer speakers, preferably with a small subwoofer to deliver the full audio range and deeper tone of a real piano. I'm currently using a basic pair of Logitech computer speakers and is quite acceptable until I can afford a high quality set of monitors or relocate my piano closer to my high quality Yamaha receiver.

I hope this info helps a bit.

I have a Korg Concert Piano (C-15S) which was working perfectly till about two months ago. I have been on vacation for two months, had left the piano unplugged from the electric supply point, but on re-connecting now, I get no sound from it. Is there a reset button (or other device) that I may have to use? Appreciate your advice.

Thank you,

L. Paul