General Troubleshooting 2
5977B Series MSD Troubleshooting and Maintenance Manual 39
MSD turns on, but then the foreline pump shuts off
MSDs will shut down both the foreline pump and the high vacuum pump if the
system fails to pump down correctly. This is usually because of a large air leak:
either the sideplate has not sealed correctly, or the vent valve is still open. This
feature helps prevent the foreline pump from sucking air through the system,
which can damage the analyzer and pump.
See “Pumpdown failure shutdown” on page 156. You must power cycle the
MSD to recover from this state.
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