Turbo pump won't come up to speed (automatically shuts off)


Today, there was an issue with the 5977 GCMS trying to initialize, then I noticed the MS door was slightly open, even with the MS door screw screwed in. The instrument was left in a pumped down state 1.5 months ago, sometime between now and 1.5 months ago the vacuum was lost and the door became unsealed.

I closed the door and the turbo pump speed would reach around 25-30% then automatically shutoff. After reinstalling the column and re-sealing the door, the turbo pump would still not come up to speed and would shutoff at around 50-50% speed.

Any ideas what would have cause the GCMS to lose vacuum after being left idle in a pump down state? Why is the Turbo Pump not reaching up to speed?

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