Hi German,
We have a Delta plus XP. We had trouble like that some time ago. It was the
switch analyzer pumps that was malfunctioning (switching on and off by
itself). You could hear it switch by moving you hand in the neybourhood
(static electricity). We do not have inlet pumps so I changed (a bit fine
soldering especialy to get it loose) that switch with the analyzer one.
Since then it worked fine.
regards,
Arnold

German Mora wrote:

> Hi,
>
> I was wondering if any of you could help us with this problem in our
> Finnigan Delta Plus XL.  This weekend, one of my students opened the
> needle valve for continuous flow work.  He then switched the source on,
> waited for few minutes to make sure that the water background was
> decreasing, and then he put the lid back on top of the
> mass-spectrometer.  Apparently, one of the sides of this lid fell
> somewhat hard on the instrument.  After that, the emission and high
> voltage LED were flickering.  The computer shows that the filament is
> off.  I can see that the LED for the emission is on, but the one for
> high voltage is off. When I pressed the source off, the high voltage LED
> comes on briefly and then it faints. Also, when I switched the source
> on, there is a high pitch, but barely audible sound coming from the
> right panel of the mass-spec.  I already checked to see if one of the
> wires or connections was loose, but everything seems fine.  I am hoping
> that any of you could give us some idea about how to fix the problem.
>
> Thanks for your time,
>
> Regards,
>
> German
>
> --
> Germán Mora
> Assistant Professor
> Depart. of Geol. & Atmosph. Sci.
> Iowa State University
> Ames, IA 50011-3212
>
> Phone: 515-294-7586
> Fax:   515-294-6049
> E-mail: [log in to unmask]