Agilent Technologies 7250 Troubleshooting And Maintenance Manual page 42

2 General Troubleshooting
No peaks found
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Temperature control disabled
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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:
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42
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
One of the heater fuses has failed
MS electronics are not working correctly
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
7250 Accurate-Mass Q-TOF Troubleshooting and Maintenance Manual