PDA Error-- Need Help!
We have an Acquity UPLC system with 4-column manager, PDA, and FLR (currently FLR is not in use), on Empower 2. I am getting this PDA error repeatedly. The system was purchased in 2008 and never had this error before (or on any other Acquity in our lab), there was no recent changes on the system that I know of.Whether sample set run or just monitoring a baseline, the PDA suddenly stops working in the middle with an alarm sound and red LED on the hardware and huge noises (I 've seen up to 170AU!!) on the chromatogram. Both Empower and Acquity console indicate "Communication Error" and the reset on the console wouldn't work. The PDA needed reboot and after that, it starts working well, but the same error happens again during an injection or baseline monitoring. When this happens, the Empower Message Center shows "Dsp Time Stamp Qualification (xxx)" Warning. I searched this cryptic message but I couldn't find out what it really means... (xxx) are numbers, it seems the time point the error happened, but one occasion it was 9396127744.00. No idea what this is. We are trying to reach to the local Waters technician but he is a super busy guy and we are really desperate. Has anyone had this problem before? What is causing this error? I just replaced the PDA lamp and the Ethernet switch and still the error is happening. Any information is appreciated. Thanks.