Chromatography Forum

Hello People of Chromatography Forum,

I am having some issues with our Agilent 7890A GC coupled with an Agilent 7000 QQQ MS. The system had been running very well for months and a few days ago we started receiving errors when we were running a sequence. After a few samples it read "QuQ fault detected 1.2 ion body driver cannot maintain requested voltage". Then we tried to tune the system and would see multiple error messages: "2.9 cable to the valve board not connected, 2.10 cable to the octopole board is not connected, 2.12 cable to the multiboard is not connected, 4.13 cable from main board 2 to the flow control board is not connected."

There was no MS maintenance done prior to this occurring, as I said we successfully analyzed samples just before this problem began. We did repair the heating coil in the oven a day or so before this problem began. Even though this is a MS/MS we have not been using the MRM analysis. It seems to me to be a component of one of the main boards not correctly regulating current and voltage to the source. I am looking for anyone who has experienced a similar problem and/or who may have some tips. I am hoping to avoid having to call an Agilent service rep or buy a brand new main board or two.

Thanks.

Hello,

I am working on 7890B and 7000C model and I had the error "1.2 ion body driver cannot maintain requested voltage" some time ago but that happened after source cleaning. In this situation the brown wire that connects to the extractor lens was touching the body. The wire should not touch the body - you must slightly pull it away even though it has an insulator.
Also check the fuses -you have 2 fuses of 12.5 A and 2 of 8. Check if the reading is around 1 Ohm. If the reading is much > 1 the fuse is bad.

Best
M

Meggie1983,

Thank you very much for the reply. We pulled out all 4 fuses today and used a multimeter to measure the resistance. Unfortunately they all seemed to be working fine. We installed an old EI source without an extractor lens and the filament would turn on, but then fault and would not allow an instrument tune.

Thanks again for the suggestions.

Hello,

Could you please inform us how did you solve this problem? Regards

I recently began receiving the error message "QqQ fault detected: 1.2 Ion body driver cannot maintain the requested voltage" on my QQQ 7000 Series. I saw there were a couple posts about this same error message awhile back, would someone please share with me how this issue was ultimately resolved.

Thanks,
Frank
barrettaf@michigan.gov

Unfortunately, the analyst that actually fixed this problem has left our company but I will try and fill you in the best I can.

We had called an Agilent service rep to come take a look at it. He tried tried replacing a few cables and the main board, but that did not fix the problem and he did not seem to have more ideas.

We eventually concluded that the extractor lens post was so long it was causing the short onto the ion source body. Our old analyst explained to me that he cut a small portion of the post off so that it wouldn't protrude and cause a short.

We did not consult Agilent about our fix and I understand if you are wary about chopping up source parts, but we have not had this problem resurface since the fix was done around March.

I hope this short explaination helps your problem.

I had that fault once and as previously noted, the pin on the lens elements is a little long and if you do not get them centered in the slot on the side of the source, they can touch the side of the source since the insulated part of the wire that slides onto the pin doesn't cover the entire pin. If the pin slides up or down a little it will contact the source body. Simple fix is to slide the pin away from the ion body, but the connectors really need to be longer so the insulation covers the whole pin.

After than I also had a problem with no current to the filaments, and it turned out I needed a new filament driver board, the small one at the very front of the side plate. Not sure if the shorted pin cause the failure or not, but replacing the board solved that problem.