Chromatography Forum

I'm looking for technical help with an Agilent/HP 1946D MSD. Here's what's happening:

- if i try to do an autotune it comes up with "difficulty with ion
optics electronics - Quad DC fault"
- it fails all points of the MSD ion optics test giving "quad DC fault"
for each of the failures
-it fails the MS Quad electronics test on the RF drive scan part, the
chart is spikey instead of a straight line
-the machine is powered up and otherwise functional.

With all that information, what do you think whats wrong? Any suggestions are greatly appreciated!

John

I'm looking for technical help with an Agilent/HP 1946D MSD. Here's what's happening:

- if i try to do an autotune it comes up with "difficulty with ion
optics electronics - Quad DC fault"
- it fails all points of the MSD ion optics test giving "quad DC fault"
for each of the failures
-it fails the MS Quad electronics test on the RF drive scan part, the
chart is spikey instead of a straight line
-the machine is powered up and otherwise functional.

With all that information, what do you think whats wrong? Any suggestions are greatly appreciated!

John

It could be several things. The first thing I check on any sort of power or electronics fault is making sure all the connections are good. I have had our 5973 MS lose connection where the pins from the quad attach to the side board. Cleaning the pins and re-assembling does the trick. If all the connections are good, and there is no physical damage to the quad,then you are most likely looking at a bad board or power supply. I have not worked on a 1946 so I can't really give specifics.