I have sold a variety of used equipment to The Music Room, in Erie, CO, including an older Nakamichi MusicBank MB-1, a 7 disk CD player. I had a similar issue with the CD player. It appeared to be dead when taken out of storage, but I exercised the unit for some days and it returned to working status. Curiously, some CDs would play, and some would not play. I initially got only partial audio output, then eventually, all outputs returned to working order. It's worth a try.
The Music Room has Covid restrictions, so you will probably have to ship everything to their location.
The Music Room has Covid restrictions, so you will probably have to ship everything to their location.