Waters 2695 stopped sending inject start signal

[scottythree]

I have a 2695 that stopped sending an inject start signal during a run. The injections completed but data was not collected. I was thinking perhaps I had a brownout that did something weird to my A/D box at first.

I tried to start the run over and noticed the 2695 goes through the sequence of selecting the vial, drawing sample and injecting but the A/D box and autozero on the detector did not trigger.

I have placed a multimeter on the outs of the inject start. I get a 5V signal but it doesn’t blip/zero momentarily when it injects. For comparison I tried this on another system and it blips when it injects. The system seems to function and reboot just fine but can’t trigger an inject start.

I can wire my A/D box and detector autozero to a switch out with a programmed timed event at 0.01 sec to trigger (simulates the inject start trigger) and this works.

Has anybody ever come across this before? I'm worried the 2695 CPU board is failing and this board is an expensive part!

[scottythree]

I forgot to add that I tried a new green connector clip and it still did not work. I can short the two wires together and the A/D box and detector autozero trigger so the wires are/were good.