Specifications

General Troubleshooting 2
5975 Series MSD Troubleshooting and Maintenance Manual 51
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
• Turbo pump is on but has not had enough time (5 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
• Turbo 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
usually 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.
The system is in vent state
The message says the system is vented, but if the fault has just occurred it may
still be under vacuum and the diffusion pump may still be hot or the turbo
pump may still be at high speed. Wait at least 30 minutes after seeing this
message before you actually vent the MSD.
• System was vented on purpose (no problem)
• Fan fault has turned off the high vacuum pump (power cycle the MSD to
clear the fault)
• Fuse for the high vacuum pump has failed
• Diffusion pump heater cartridge has failed
• MSD electronics are not working correctly
CAUTION
Venting the MSD too soon after this message appears can damage a turbo pump.