Specifications

48 5975 Series MSD Troubleshooting and Maintenance Manual
2 General Troubleshooting
Difficulty with the HED supply
The only time this error occurs is if the output of the supply cannot get to its
destination (the HED).
• Large peak, such as the solvent peak, eluted while the analyzer was on
• Pressure in the analyzer chamber is too high
• Detector is not working correctly
• MSD electronics are not working correctly
Difficulty with the high vacuum pump
In an MSD equipped with a diffusion pump, this indicates the diffusion pump
became too hot. In an MSD with a turbo pump, this indicates the pump failed
to reach 50% of full speed within 7 minutes or experienced a fault.
You must switch the MSD off and back on to remove this error message. Be
sure the diffusion pump has cooled or the turbo pump has slowed down before
switching off the MSD. The message will reappear if the underlying problem
has not been corrected.
Diffusion pump
• Air intakes to the cooling fan are blocked
• Laboratory temperature is too high (generally above 35 °C)
• High vacuum signal cable is disconnected or not working correctly
• Diffusion pump temperature sensor is not working correctly
• MSD electronics are not working correctly
Turbo pump
• Large vacuum leak is preventing the turbo pump from reaching 50% of full
speed
• Foreline pump is not working correctly
• Turbo pump is not working correctly
• Turbo pump controller is not working correctly
• MSD electronics are not working correctly