Problems with Musical Fidelity A 3.5 CD

Hi All,

I bought a used MF CD player on a-gon. I'm assuming that the seller was reliable, but I get the "No Disc" message on many CDs. Sometimes if I wipe them off they then register and play, but sometimes CDs that have played fine on other units can't be read.

Any ideas?

Thanks, as usual,

russ