welcome aboard
This is a very nice box. As a matter of fact the best bbx Radio Shack put out (in my opinion)
The only problem that this box usually has is there is a part on the deck that usually breaks and usually no good replacement parts for it. This part is located in center and will cause the deck to auto shut off. It can however be repaired with jb weld (as i got mine repaired by a member). These are your belt sizes14-778 Belt SCY4.6, Belt SCA8.6, Belt SCX5.1 Hope this is helpful
You may want to try and replace belts 1st to see if deck is working
This is a good supplier for parts/belts
http://www.studiosoundelectronics.com/