Agilent Technologies 7000 Triple Quadrupole GC/MS, Maintenance Manual

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44 Troubleshooting and Maintenance Manual
2
General Troubleshooting
Lens supply fault
• Electrical short in the analyzer
• MS cannot maintain the voltage setpoint
•
MS electronics are not working correctly
Log amplifier ADC error
• MS electronics are not working correctly
No peaks found
• Emission current was set to 0
•
Electron multiplier voltage is too low
• Poor mass axis calibration (either front or rear quad)
• Width gain or offset is too high (either front or rear quad)
•
Calibration vial(s) empty or almost empty
• Excessive pressure in the analyzer chambers
• Air leak
•
Signal cable is not connected
• Electrical leads to the detector are not connected correctly
• HED power supply output cable failed
•
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) heaters:
• Source temperature sensor is open
•
Source temperature sensor is shorted