• According to YamaT, and already memo-ed in S1605873 , the closed are JP21-36, which are for the output BNC sides. There are also JPs for the input Dsub sides but were left opened (as "default"). So still need to care from which boards the Dsub cables to this board have come.
• Looking at the circuit diagram of S1605873 , the next time if we will do some noise hunting around this board, we may would like to open JP11 and 12 to put traps (make effective the inductor paths) in the power supply line.