General Troubleshooting 2
Troubleshooting and Maintenance Manual 27
General Symptoms
This section describes symptoms you might observe when first turning on the
GC/MS system. All 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
MS does not turn on
Nothing happens when the MS is switched on. The foreline pump does not
start. The cooling fan for the high-vacuum pump does not turn on. The local
control panel (LCP) does not turn on.
• Disconnected MS power cord
• No voltage or incorrect voltage at the electrical outlet
• Failed primary fuses
• MS electronics are not working correctly
Foreline pump is not operating
The MS is receiving power (the fan is operating and the local control panel is
lit) but the foreline pump is not operating.
• A large air leak (usually the analyzer door open) has caused pumpdown
failure. See “Pumpdown failure shutdown” on page 132. You must power
cycle the MS to recover from this state.
• Disconnected foreline pump power cord
• Malfunctioning foreline pump
• Check power switch on foreline pump
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