GTO 46 (1974) the paper stop solenoid coil is not working properly.

Hello everyone!
GTO 46 model 1973/1974 (without rectifier, with a three-phase contactor and 3 others for 220v commands; the transformer has a single winding for 220V).
After switching to work mode, with the lever to paper on, due to the lack of voltage to the electromagnet coil of the paper stop (which manages the vacuum) the machine takes the sheet all the time. I have checked everything possible .

 

Have you checked to see if there is voltage at the solenoid, if there is voltage and no action at the solenoid valve, the solenoid coil may be burned.

 

Tanks for support,
When the machine is connected to electricity, there is voltage on the coil and the vacuum is off; when the lever is activated to start printing, the voltage disappears and the vacuum is on all time, so the solenoid is ok.
There are three switches on the lever (marked b72) and a contact from one of them cuts off the voltage on the coil. There is probably another contact in parallel with b72 so that until the machine is prepare to print the coil must to be under voltage and then an other switch of b72 cut the voltage and paper is on. The data in the diagrams which I have do not correspond to the real situation.