General Troubleshooting 2
5977B Series MSD Troubleshooting and Maintenance Manual 57
• HED power supply output cable failed
• Electrical leads to the ion source are not connected correctly
• Filament shorted to the source body
Temperature control disabled
• One of the heater fuses has failed
• MSD 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 mass filter (quad) heater. The cause can be further
isolated by selecting mp Status/MS TeCtlr Status in the Tune and Vacuum
Control view. One of the following should be displayed as the cause:
• 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
The high vacuum pump is not ready
• Turbo pump is on but has not had enough time (5 minutes) to reach 80% of
its normal operating speed
• Turbo pump is not working correctly
• MSD electronics are not working correctly
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