I recently recieved a replacement belt for my previously not working FDS and installed it. The sytem now reads the discs but I get an error message of either 21 or 22 with each of the disks I insert. I have searched this site and have read that either I need to adjust the speed of the belt spinning or I need to do a disc alignment. I would like to try the option that is most likely to correct my problem first. Any suggestions as well as a link to a site with instructions would be appreciated.