54 5977B Series MSD Troubleshooting and Maintenance Manual
2 General Troubleshooting
Error Messages
Sometimes, a problem in your MSD will cause an error message to appear in
the MSD Data Acquisition software. Some error messages appear only during
tuning. Other messages may appear during tuning or data acquisition.
Some error messages are latched. Latched messages remain active in your
data system even if the condition that caused the message has corrected itself.
If the cause is removed, these messages can be removed by checking
instrument status through the data system.
Difficulty in mass filter electronics
• Pressure in the analyzer chamber is too high
• RFPA is not adjusted correctly
• Mass filter (quad) contacts are shorted or otherwise not working correctly
• Mass filter is not working correctly
• MSD electronics are not working correctly
Difficulty with the electron multiplier supply
• Large peak, such as the solvent peak, eluted while the analyzer was on
• Pressure in the analyzer chamber is too high
• MSD electronics are not working correctly
Difficulty with the fan
If a cooling fan fault occurs, the vacuum control electronics automatically shut
off the high vacuum pump, the ion source, and the mass filter heaters. The
message: The system is in vent state may also appear. It is important to note
that even though the high vacuum pump is off, the analyzer chamber may not
actually be vented. See “The system is in vent state” on page 58 for precautions
to take.
• One of the fans is disconnected
• One of the fans has failed
• MSD electronics are not working correctly
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