The System Is In Vent State; There Is No Emission Current; There Is Not Enough Signal To Begin Tune - HP 5973 Hardware Manual

3
Error messages

The system is in vent state

Although the message says the system is in vent state, if the fault has just occurred
the MSD may actually still be under vacuum and the diffusion pump may still be
hot or the turbo pump may still be at high speed. Wait at least 30 minutes after
seeing this message before you actually vent the MSD.
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Venting the MSD too soon after this message appears can result in the backstreaming of
a diffusion pump or damage to a turbomolecular pump.
• System was vented on purpose (no problem)
• Fan fault has turned off the high vacuum pump (power cycle the MSD to clear
• Fuse for the high vacuum pump has failed
• Diffusion pump heater cartridge has failed
• MSD electronics are not working correctly

There is no emission current

• Filament is not connected properly
• Filament has failed
• MSD electronics are not working correctly

There is not enough signal to begin tune

• Poor mass axis calibration
• Amu gain or offset is too high
• Calibration vial is empty or almost empty
• Excessive pressure in the vacuum manifold
• Air leak
• Electron multiplier voltage is too low
• Signal cable is not connected
• Electrical leads to the detector are not connected correctly
• Electrical leads to the ion source are not connected correctly
• Filament shorted to the source body
88
Troubleshooting the MSD
the fault)