Compare this picture from post #400 in the Mess in AMS Today thread to the one in post #54 in this thread.

They both show the same security access point, which is diagonally opposite the KLM SkyPriority check-in area, and right next to door F in Departures 2.
Departures 1 has its own access to security, in the far right corner behind the check-in desks. For all I know it my be closed, though.
Johan