General Troubleshooting 2
Troubleshooting and Maintenance Manual 43
The high-vacuum pump is not ready
• One of the three Turbo pumps could have failed
• Turbo pump is on but has not had enough time (10 minutes) to reach 80% of
its normal operating speed
• Turbo pump is not working correctly
• Foreline pump has not reached its target of 10 Torr after 10 minutes
• MS electronics are not working correctly
The system is in vent state
The message says the system is vented, but if the fault has just occurred it may
still be under vacuum and the turbo pump may still be at high speed. Wait at
least 30 minutes after seeing this message before you actually vent the MS.
• System was vented purposely (no problem)
• Fan fault has turned off the high-vacuum pump (power cycle the MS to clear
the fault)
• Fuse for the high-vacuum pump has failed
• MS electronics are not working correctly
There is no emission current
• Check tune file to be certain that emission current is not = 0
• Filament is not connected properly; try the other filament
• Filament has failed; try the other filament
• MS electronics are not working correctly
There is not enough signal to begin tune
• Corrupted tune file
• Poor mass axis calibration
Venting the MS too soon after this message appears can damage a turbo pump.
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