Having problems with a Sony SL-HFR70 Betamax
 

Hey all, this is my first trip from Audiokarma to here. Recently picked up a couple Betamax machines, the aforementioned SL-HFR70 and an SL-810D. I flipped the SL-HFR70 but my buyer is having trouble with it. Tapes transport normally into the machine, but then are ejected some seconds later. He tried around 10 tapes, one transported into the machine and autoplay started normally, the rest are ejected and won't autoplay. I used it for a while and did not experience this problem. I really don't know much about these machines, any help would be greatly appreciated.