G1946D autotune fail vcap

We recently reactivated an old G1946D with ESI-source which had low signal intensity before shutdown. After Cleaning everything, the signal intensities while autotuning with ESI-mix where better, but while trying to tune vcap it fails at 1700-2000V with the error "no ions found". Using the default settings I get around 32nA CapCurr and 1.6uA ChamCurr. In manual tune mode, ion count (for the 622 m/z ion) drops to noise level at around 1500V. Vacuum seems ok with 1.2-1.5x10-5 torr.

I wonder what would be the best order of (recleaning/ replacing) parts and what would cause this symptom.

With kind regards, Martin

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  • Thank you very much for this hint,

    The spring in the front seems to be visually intact. To check the spring in the fragmenter I need to vent the system (which I will do after performing some other tasks). The spring in the back is only accessible by removing the desolvation assy, right? Are there any reference values for the resistence or is it only good or none?

    kind regards

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