Any common problems with either? Any unobtanium parts? Both are at my local thrift and don't work. Yamaha tray won't open so I'm hoping it's a belt. Pioneer has single disc tray only and won't read. Yes, I know to insert disc label down, still no bueno. Tomorrow is 50% off day, I'm an insomniac, and both were in excellent cosmetic condition so I figure unless someone tells me not to, I'll go back at 9 AM and grab both.