28 Troubleshooting and Maintenance Manual
2 General Troubleshooting
MS turns on but then the foreline pump shuts off
The MS 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 side plate 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 132. You must power cycle the MS
to recover from this state.
Local control panel says “No server found”
• Disconnected LAN cable between MS and the hub, or the hub and the PC
• PC is turned off
• Holding the No/Cancel key down for 5 seconds will bypass error and allow
the user to look at the LCP.
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