its your board, theres a relay on the board that you can jump to
if you have board p/n 18491 , does the pump shut off also, or just the press?? the problem you have is there is few things that can cause your problem.let me know if you need copys of full electrical...
one way to know if the clutch springs our cheap is the weild count should be three, also sometimes the clutch assembly counter balance assembly can wear to were it can break the springs, hope that helps.
heidelburg 52 has a problem where the sheet stop button when pressed does not take machine of impression,however it does stop the pump while pressed in , where is the sheet detector on this press??