We have a ThermoFinnigan DeltaPlus Advantage for continuous flow analysis of N2O that lost a turbo some time ago. The turbo was replaced and the system is now leak free. Now, however, cup 1 (mass 44) seems dead. No signal at all. After recalibrating N2O, doing a mass scan, and of course, rebooting, cup 1 is still showing no signal. I have swapped the amplifier boards for cups 1 and 2 yielding no signal on cup 1 and the expected signal decrease on cup 2. Cup 1 does not seem to be shorted with the sidewalls of the flight tube after a conductivity test. Upon unplugging the signal cable that travels from the amplifier boards to the data processing mother board, the signals of cups 2 and 3 go to zero but cup 1 goes to 50V...this piece of evidence seems to speak to the mother board being the problem. Can anyone weigh in on this problem? Your thoughts and time are greatly appreciated!
Department of Earth and Space Sciences
University of Washington
Seattle, WA 98195
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