Hi Adam, my name is Rusty. The power cord concerns me, that can cause multiple problems including fire. Let's start there. I'll need you to replace the power supply with an exact match to rule out the power as the problem.
When I initially read your question, the notes playing louder are caused by velocity sensitive pads that are struck when you hit a key, and they send a message to the tone generator to play a note either soft, medium or loud. When they wear out, they only play loudly. The pads can be replaced.
Once we know that the power supply isn't an issue, we can continue with the pads.
Ok, so it's still playing random notes? Do they play when you touch the keys, or not touching the keys?
That's not a good sign, will the demo song or percussion play?
I don't think I'm going to be able to help you with it. You first described a processor going out, which is BAD news for the piano. Now that it's not doing anything at all, I believe your motherboard has gone out. I'll open the question back up to all experts.
Hi, I am Tech Michael a specialist expert in this field and I will be assisting you today. I am a Master Technician that's dedicated to giving you the best Answer possible.
If you are new to the site, this is briefly how it works:
1. We may need some back and forth to exchange information (if needed) and there is no extra cost for replying.
2. I will give you the best possible Answer for your problem without the ability of actually being present with you.
The better you describe the problem
, the quicker I can help ;-)
3. Remember to leave a Positive Rating after we're finished. it doesn't cost anything additional to rate kindly;-)
I am only compensated for my time and expertise if you rate kindly.
How old is your Technics piano?
Also does it get a lot of use? And has this happened before?
And were there any power outages or surges that you may be aware of just prior to this problem?