3 Troubleshooting the MSD
Error messages
87
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 iso-
lated by selecting
Status/MS Temp Ctlr Status in the Diagnostics/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
The high vacuum pump is not ready
• Diffusion pump is on but has not had enough time (10 - 15 minutes) to reach its
normal operating temperature
• Turbomolecular pump is on but has not had enough time (5 - 10 minutes) to
reach 80% of its normal operating speed
• Level of fluid in the diffusion pump is too high
• Diffusion pump stack is not aligned correctly
• Turbomolecular pump is not working correctly
• MSD electronics are not working correctly
The system is in standby
This message is triggered by a shutdown signal on the remote start cable. It is usu-
ally caused by a GC fault, an ALS fault, or a bad cable connection. Once the cause
of the fault is corrected, selecting
MS ON or checking MSD status should remove
the message.
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