Hi, yes… power supply may have bad capacitors. If I were you I would bring it to a professional repair shop that fixes vintage gear. My Ensoniq ASR-10 keyboard had this problem. It needed new capacitors on it’s power supply due to it’s age. Some places will rebuild the power supply for you. I found a guy on ebay. I had a conversation with him. I had to remove my dead power supply, ship it to him. He sent me back a freshly rebuilt one within a week. He also used to work for Ensoniq. Maybe he can fix your power supply. He’s a pro. His name is Mike Adkins. Look on Ebay for Ensoniq ASR 10 rebuilt power supplies. That’s him. Maybe send him a message and see if he’ll do the repair or know someone else who you should send it to. I hope this helps… Good luck my brother.