I centerred the IM4 trans QPD in HAM2 using a picomotor. I moved it from (X,Y) = (0, 0) to (500, 19000). Before I centered it, the beam was not hitting the segment 1 and 2.

Also, I plugged the IO_CAB_243 (see D1200666-v11) to the first input of the picomotor controller box #5. This cable had been disconnected for some reason.