38 5977B Series MSD Troubleshooting and Maintenance Manual
2 General Troubleshooting
General Symptoms
This section describes symptoms you might observe when first turning on the
GC/MSD system, and their possible causes. Any of these symptoms would
prevent operation of the system.
GC does not turn on
Nothing happens when the GC is switched on. The GC fans do not turn on, and
the keypad display does not light.
• Disconnected GC power cord
• No voltage or incorrect voltage at the electrical outlet
• Failed fuse in the GC
• GC power supply is not working correctly
MSD does not turn on
Nothing happens when the MSD is switched on. The foreline pump does not
start. The cooling fan for the high vacuum pump does not turn on.
• Disconnected MSD power cord
• No voltage or incorrect voltage at the electrical outlet
• Failed primary fuses
• MSD electronics are not working correctly
Foreline pump is not operating
The MSD is receiving power (the fan is operating), but the foreline pump is not
operating.
• Large air leak (usually the analyzer door open) has caused pumpdown
failure. See “Pumpdown failure shutdown” on page 156. You must power
cycle the MSD to recover from this state.
• Disconnected foreline pump power cord
• Malfunctioning foreline pump
• Check power switch on foreline pump
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