When I do a full scan in manual tune I get a bunch of electronic noise starting around mass 500. I know it has something to do with the analyzer. I cleaned the source and was able to swap the analyzer with another 5975 and the noise was about the same on the 2nd mass spec. The voltage on the multiplier is ok.
I tried a new feed thru part and a new red high voltage power cable. I also tried some different source parts.