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Trouble Shooting: Bad VacuumYou may have a bad vacuum if you encounter one of the following:1. Can't pump down the vacuum 2. Can't power-up the system 3. System unstable after being powered up, meaning it would shut down for no other obvious reasons. There will be a lot to check in this situation. Starting from the most likely, below is a suggested partial check list. Defected x-ray tube front cover o-ring (see change filament) Bad x-ray tube vacuum release nut o-ring (see change filament) Damaged x-ray tube side cover o-ring (see polish anode) Bad filament connection (see change filament) Filament connection terminal uncovered or covered improperly (see change filament) Dirty filament holder (see change filament) Dirty anode (see power-up) Bad turbo molecular pump (TMP, you should hear very loud noise from it) Bad roughing pump (RP, there should be oil smell in the room or oil spill around where the RP is located) |
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