Dissasemble the detector on Agilent LCMS D series system

[ushyam]

Am getting an HED fault when am running the diagnostics and also the high vacuum value is low.

Anyone knows how to solve these issues?

I read in one of the forums that cleaning the detector assembly helps the HED fault but not sure how to do it.

Thanks

[lmh]

I would worry about the poor vacuum before worrying about the HED issue. A bad high vacuum is likely to mess up lots of other things too. You can check for obvious leaks, and make sure your rough pumps are doing their job (is the rough vacuum good?). If you've had the top off the instrument recently, and the bad vacuum coincides with this maintenance, check you replaced it correctly, and that the seal underneath is clean and in place. Don't do up the screws tight before turning the vacuum on; it's better to leave them loose and let the vacuum pull the top plate onto the casting. If there is no obvious solution to the vacuum issue, you will probably have to contact Agilent; the sorts of data they will need to know are the turbo pump speeds and powers (see diagnostics diagram).

Cleaning the HED won't make your instrument work if you have poor vacuum, but there is an instruction video on one of the CD's you should have with the instrument.

Good luck!