Chris,

Others have mentioned potential trouble on the emission control 
board, which I would agree with. We have just sorted out a problem 
where the board wasn't working, after the fuse blew. Replacing the 
fuse didn't get it working again though: it turned out that the heat 
generated from the fuse blowing damaged the fuse holder solder connections.

Paul Eby
University of Victoria



> > 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
> >