Turbomolecular Pump; Foreline Pressure Has Exceeded 300 Mtorr; Internal Ms Communication Fault; Lens Supply Fault - HP 5973 Hardware Manual

Troubleshooting the MSD
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Error messages

Turbomolecular pump

• Large vacuum leak is preventing the turbo pump from reaching 50% of full speed
• Foreline pump is not working correctly
• Turbo pump is not working correctly
• Turbo pump controller is not working correctly
• MSD electronics are not working correctly

Foreline pressure has exceeded 300 mTorr

Only diffusion pump-equipped MSDs have a foreline pressure gauge.
• Excessive carrier gas flow (typically > 5 ml/min)
• Excessive solvent volume injected
• Large vacuum leak
• Collapsed or kinked foreline hose
• Foreline pump is not working correctly
• Foreline gauge is not working correctly

Internal MS communication fault

• MSD electronics are not working correctly

Lens supply fault

• Electrical short in the analyzer
• MSD electronics are not working correctly

Log amplifier ADC error

• MSD electronics are not working correctly

No peaks found

• Emission current was set to 0
• Electron multiplier voltage is too low
• Amu gain or offset is too high
• Calibration valve is empty
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