ISOGEOCHEMers:

We have a Delta Plus that recently lost source HV and emission (but not 
high voltage) for an unknown reason.  After fixing the vacuum system, we 
were still unable to restore emission.  We have tried replacing the 
filament, checked the source leads, checked the filament on the board 
(J48/49), board fuse looks good and source ceramics are all intact.  
We've even tried just powering down the instrument and that didn't work 
any magic.

Any ideas?  We're fresh out right now, and any help would be most 
appreciated.

Thanks,

Chris Yarnes

-- 

Chris Yarnes, Ph.D.
SIRF Manager
Dept. of Earth and Space Sciences
University of Washington
Seattle, WA 98195
206.543.6327