My 1970 Polar 150 EL is not cutting, everything else is fine and I can initiate a cut if I press in a relay on the LS board. The barrier photocells are giving different readings, but I don't think this is the problem. I had a Polar mechanic along to look at the problem he said that the amplifier board is showing only a little voltage. He than shrugged saying that there were no more parts for this machine and sent me a whopping bill. After the holidays I switched it on again and its been going great until now…the same problem. Is there anything else I can try?