5975 Mass Axis Issue

Discussions about GC-MS, LC-MS, LC-FTIR, and other "coupled" analytical techniques.

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Hello everybody been having some issues with our 5975 GCMS.
We initially set up the instrument after having to swap it with an old 5973. This 5975 was received from another lab a few years ago and had not been used since we bought it.

After setting it up and autotuning once the first autotune looked great so we calibrated the instrument. within three days we did a "generate report" which we do before every analytical run and the masses of 219 and 502 had shifted significantly. we then generated reports every day for a week and watched as those masses slowly drifted until they were out of the frame of view.

Our Agilent tech immediately suspected the sideboard as a defunct one often causes these Mass Axis problems. So we purchased a new side board (for 5975 and 5977 A/B). After installing the new sideboard we repeated the same experiment running an autotune, which looked fine, and then generating reports everyday. the exact same shifting occurred.

We then swapped the sideboard with the sideboard from our functioning 5977A to test if the new sideboard was the issue.

This did not resolve the problem.

Does anyone have any suggestions on next steps or has anyone seen this kind of problem before?
thanks
The other things that would be involved in that would be the power supply and the main board.

If you power down for a while, then bring it back up after a few minutes and later test the mass axis, if it returns to the original point then I would suspect maybe the power supply is fading over time.

Also, have you cleaned the quads? If some type of heavy contaminate has gotten on them that won't bake off, it can cause problems also. The other thing I look at is the rigid wires that connect to the quads, to make sure they are not touching or near touching, since they can be easily moved if you bump them when installing the analyzer.

Is the analyzer of the 75 compatible with the 77? If so can you swap the analyzer and see if the problem follows? If it doesn't, then for certain it is either the power supply or main board of the 75, if it does follow then it is in the quads themselves.
The past is there to guide us into the future, not to dwell in.
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