David.M, Filiberto.C

Yesterday I was looking at the NN array output channels to check everything was working and noticed that the 7th NN channel (H1:NGN-CS_L4C_Z_7_OUT) was producing a noisy output about 3 orders of magnitude higher than expected. I thought potentially the L4C might be busted, so I went into the LVEA this morning and swapped it out for another one that we tested earlier (L41429). The problem remained even with the new sensor and also even when the sensor was unplugged. We went into the CER to diagnose where the problem was. Turning off the L4C interface chassis and the AA chassis both didn't fix the problem, which seems to indicate that the large noise level in this channel is caused by a problem in the I/O Chassis.