That should be reasonable simple. Open the camera to get access to the wiring and have some electronics specialist find out the source of the trouble.
Are you sure the problem is not originating in the battery compartment?
From experience with cine-cameras of the same age I can say that even a switch could be the source. Actuate all switches several times before considering a more serious failure. Just this week I had such a case. It did not work at all. Some actuating of the speed selector made it work at some attempts, then regularly.
Last edited by AgX; 08-18-2013 at 10:10 AM. Click to view previous post history.