42 Troubleshooting and Maintenance Manual
2 General Troubleshooting
No peaks found
• Emission current was set to 0
• PMT or MCP voltage is too low
• Calibration vial(s) empty or almost empty
• Excessive pressure in the analyzer chamber
• Air leak
• Signal cable is not connected
• Electrical leads to the MCP are not connected correctly
• Electrical leads to the ion source are not connected correctly
• Filament to the source body is shorted
Temperature control disabled
• One of the heater fuses has failed
• MS electronics are not working correctly
Temperature control fault
This indicates that something has gone wrong with the temperature control of
either the ion source or the mass filter (quad) heater:
• Source temperature sensor is open
• Source temperature sensor is shorted
• Mass filter (quad) temperature sensor is open
• Mass filter (quad) temperature sensor is shorted
• No heater voltage (heater fuse has probably failed)
• Heater voltage is too low
• Temperature zone has timed out (heater failed, bad heater wiring, or loose
temperature sensor)
• Problem with the temperature control electronics
• Source heater is open
• Source heater is shorted
• Mass filter heater is open
• Mass filter heater is shorted
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