Difficulty With The Fan; Difficulty With The Hed Supply; Difficulty With The High Vacuum Pump; Diffusion Pump - HP 5973 Hardware Manual

Troubleshooting the MSD
3
Error messages

Difficulty with the fan

If a cooling fan fault occurs, the vacuum control electronics automatically shut off
the high vacuum pump and the ion source and mass filter heaters. Therefore, 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 vacuum manifold may not actually
be vented. See The system is in vent state in this section for precautions to take.
• One of the fans is disconnected
• One of the fans has failed
• MSD electronics are not working correctly

Difficulty with the HED supply

• Large peak such as the solvent peak eluted while the analyzer was on
• Pressure in the vacuum manifold is too high
• Bad cable connection between the detector and the MSD electronics
• Detector is not working correctly
• MSD electronics are not working correctly

Difficulty with the high vacuum pump

In an MSD equipped with a diffusion pump, this indicates the diffusion pump
became too hot. In an MSD equipped with a turbomolecular pump, this indicates
the pump failed to reach 50% of full speed in a preset time or experienced a fault.
You must switch the MSD off and back on to remove this error message. Be sure
the diffusion pump has cooled or the turbo pump has slowed down before switch-
ing off the MSD. The message will reappear if the underlying problem has not
been corrected.

Diffusion pump

• Cooling fan for the high vacuum pump is not working
• Air intakes to the cooling fan are blocked
• Laboratory temperature is too high (generally above 35°C)
• High vacuum signal cable is disconnected or not working correctly
• Diffusion pump temperature sensor is not working correctly
• MSD electronics are not working correctly
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