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- Posts: 6
- Joined: Thu Aug 25, 2011 5:50 pm
I'm having an issue getting an Agilent 1100 LC-MS (G1946D) system to pump down. When first turning on the instrument, the rough pump turns on, and the rough vacuum very quickly drops to < 3 torr. Turbo 1 will ramp up and approach 100%, then turbo 2 will show some power but remain at 0%, then turbo 1 will immediately shut off. The high vacuum gauge never turns on and the pump down never completes (no error message, the pump down window just stays up). I did at some point get an error message (not sure how/when) that said "Turbo pump#2 showed power but no speed after turn on". The only other thing that seems potentially problematic is that the MSD electronics page shows "low" for the +28V value.
Does this seem like a turbo pump problem and/or a power supply problem? I have limited funding, so if it's a matter of swapping out a part I'd rather do that than calling in service...
Thanks for any help.
-SH