FranciscoL, TonyS

Summary: We connected a BNC from the "Out Mon" of D1300599 to "In 2" of D1400423. The channel H1:CAL-PCALX_OFS_AOM_DRIVE_MON_OUT16 now plots what the AOM is doing. Problem solved.

Earlier today I went to track where in the chain of connections the InLoopOut signal was "lost" (I made that claim in 85753). All the signals of InLoopOut were working all the way out to the TCS rack. However, after a closer look on all the schematics for the Pcal and the TCS boards, I noticed that I was tracking the wrong channel. In other words, the InLoopOut channel was not the problematic channel -- this would otherwise be a super urgent matter, as the InLoopOut is the signal coming straight from the OFS PD -- but it was the AOM Mon channel (for the interested reader, look at D1300226V13 --> page 3 --> X1-TCS-C1-4 --> second (top to bottom) 9-pi D-Sub Male output, to find the channel). At the time of realizing my mistake, the maintenance period was long over, so I left it as a pending task for our next visit to EX.

The world gifted me with very high seismic activity and Tony and I finally finished the problem by connecting the BNC that was missing according to D1300226 schematic and stated in the summary. Attached are screenshots of the ndscope before (earlier today, as I was looking for the problem) and after plugging the BNC in the chassis, in their respective order. The change is seen in the green trace on the second (top to bottom) plot.

Tagging CDS so we are all aware that the problem was solved and it is concluded now.