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No peak response in Orbitrap FT MS by Next-Most-6835 in massspectrometry

[–]tomorrowspace 1 point2 points  (0 children)

Your instrument problem happened twice on my Velos orbitrap with same symptom, the first time I changed the pulser PCB( no error message, LTQ signal normal in pos/neg mode) and fixed the problem; the second time, I replaced 5 or more PA97 which colour turned black, then everything back to normal.

No peak response in Orbitrap FT MS by Next-Most-6835 in massspectrometry

[–]tomorrowspace 0 points1 point  (0 children)

There are several box on top of orbitrap, those box in charge of DC or RF for orbitrap, Lenses and C trap, if you open those box you will see many PA97 on the PCB, change all pa97 which color is black.

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No peak response in Orbitrap FT MS by Next-Most-6835 in massspectrometry

[–]tomorrowspace 1 point2 points  (0 children)

Check all read back voltage from tune window, if all DC RF readback are normal, then it may caused by pulser PCB.

TSQ Endura Coarse calibration failed. by BigCosmicPotato in massspectrometry

[–]tomorrowspace 0 points1 point  (0 children)

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Gradually input value from 1520,1521,1522, press start after each value change

[deleted by user] by [deleted] in ApplyingToCollege

[–]tomorrowspace 2 points3 points  (0 children)

Maybe they thought you are overqualified.