58 5977B Series MSD Troubleshooting and Maintenance Manual
2 General Troubleshooting
The system is in standby
This message is triggered by a shutdown signal on the remote start cable. It is
usually caused by a GC fault, an ALS fault, or a bad cable connection. Once the
cause of the fault is corrected, selecting MS ON or checking MSD status should
remove the message.
The system is in vent state
Wait at least 30 minutes after seeing this message before you actually vent the
MSD.
• System was vented on purpose (no problem)
• Fan fault has turned off the high vacuum pump (power cycle the MSD to
clear the fault)
• Fuse for the high vacuum pump has failed
• MSD electronics are not working correctly
There is no emission current
• Filament is not connected properly; try the other filament
• Filament has failed; try the other filament
• MSD electronics are not working correctly
There is not enough signal to begin tune
• Corrupted tune file
• Poor mass axis calibration
• Amu gain or offset is too high
• Calibration vial(s) empty or almost empty
• Excessive pressure in the analyzer chamber
• Air leak
Venting the MSD too soon after this message appears can damage the turbo pump.
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