Roland E-20 w środku po zdjęciu obudowy
I will share with you the solution of the problem that I encountered with keyboard Roland E-20. I know that this is not an isolated case. E-20 is rather aged… manufactured in 1988, but because it has a soul, I decided not to give up and attempt resuscitation 🙂

Roland E-20 & L7805C-V overheated voltage regulator