I have acquired a Shimadzu QP5000 GC/MS from my former employer. I used this instrument 10 years ago and have forgotten most of what I knew. I am trying to get the instrument up and running, but cannot get the turbo pump to start. My question is what level vacuum at the fore-pump is necessary for the turbo pump to start? The Vacuum monitor in the Vacuum Control Window says the "Lower Vacuum" is 4.2e+000 Pa. Is 4.2 Pascal sufficient, or should I be getting lower values than this? BTW I checked power to the turbo pump and there is none there, so I am thinking something is keeping it offline