Hi all, I have just bought a JB940 on ebay. The unit is able to play back minidiscs recorded with an RH1 fine, but unfortunately it suffers the not so uncommon, as I have learned, problem of blank disks. That is, the unit seems to record fine from an analogue source, the sound level bars move, tracks are being made and all that. But whenever I try to play a track just recorded, the only thing I hear is the drive moving forever. Ejecting the disc and inserting it again to the JB940 results in