Spectral scan issues

[geigerjcjr]

Spectral scan is a blob from mass 50 to around 500 after changing column and cleaning source. Any suggestions?

[Don_Hilton]

what kind of instrument? GC/MS? LC/MS? Make and Model would help as well.

[geigerjcjr]

HP GC/MS 5973. Changed to new source, changed EM, isolated column, looked for backstreaming of diffusion oil, loaded old tune thinking it may be a corrupt tune issue. Doesnt seem to be any of these. Gonna change HED and source assembly next. Any ideas would be appreciated.

[Don_Hilton]

Any history on this? Did this happen all at once or has this progressed over time? And how do the quads look?

[geigerjcjr]

It happened all at once. I have actually took the whole sideplate with quads and installed it on another instrument and it worked fine.

[Don_Hilton]

My thougths go in the direction of an electronics failure - given that you describe some kind of signal, but badly formed, perhaps something related to the radio frequency generator for the quads. (And that perhaps is a guess. It has been so long ago that I had an RF section go out - and I think that was on a 5972, the symptoms are far back and lost in history for me.)