Dear Finnigan User Colleagues,

recently we have cleaned the ionsource of our Finnigan delta plus XP 
mass spectrometer (as ususally at the beginning of the year). But the 
ionsource does not want to work properly after switching on.
1) the HV is 0.33 kV instead of 2.9 kV.
2) The current on the anode (trap) is 0 mA, while on the ionization box 
it is the maximum, 1.5 mA. There should be some 0.7 mA current on the 
trap. We have checked the positions of both anode and cathod and found 
them to be good.

We have disassembled  and checked the ionsource two times, but have not 
found any unusual. The anode (trap) connection is good (and all the 
other connections) and there is no shortcut in the ionsource (on the 
front panel of the MS the green LED of "Accel Voltage" is on).
The green LED "Emission" on the front panel is on for a moment just 
after switching on the source, then turns off. Why?

If any of you has met with this symptome and has an idea about it, I 
would appreciate very much his/her help.

Best regards
István
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Dr. FÓRIZS István  ..........  Istvan FORIZS Ph.D.
Magyar Tudományos Akadémia Geokémiai Kutatóintézet
Institute for Geochemical Research, Hungarian Academy of Sciences
Cím/Address: H-1112 Budapest, Budaörsi út 45.   Hungary
Tel./Phone: (36-1)-309-2600/ mellék/extension 1151
Fax: (36-1)-319-3137
Http://www.geokemia.hu/people/forizs_hu.html
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