Hello,
I have a KR-4500 which I purchased some 25 years ago. It was used a little initially when kids were learning on a piano, and then served as a piece of furniture most of the years.
Opened it a few days ago and wanted to play and instead of hearing music notes, I heard whooshing sounds with faint notes in the background, and it's scratchy too.
Started to read about it in various forums and saw that these keyboards suffered from bad electrolytic capacitors.
So, being an engineer, I opened it up and removed and inspected the motherboard - it looks 100% clean. No capacitor leakage at all, no burnt or rusty signal paths. Looks brand new.
I don't mind embarking on a project replacing the capacitors, but wanted to hear from others who have experience with this keyboard as to other things that might cause this behavior.
Any help would be appreciated.
I have a KR-4500 which I purchased some 25 years ago. It was used a little initially when kids were learning on a piano, and then served as a piece of furniture most of the years.
Opened it a few days ago and wanted to play and instead of hearing music notes, I heard whooshing sounds with faint notes in the background, and it's scratchy too.
Started to read about it in various forums and saw that these keyboards suffered from bad electrolytic capacitors.
So, being an engineer, I opened it up and removed and inspected the motherboard - it looks 100% clean. No capacitor leakage at all, no burnt or rusty signal paths. Looks brand new.
I don't mind embarking on a project replacing the capacitors, but wanted to hear from others who have experience with this keyboard as to other things that might cause this behavior.
Any help would be appreciated.