Nakano, Enomoto, Uehara, Guiguo, Kohei Yamamoto

Today we found that something wrong happened to the common mode servo board. 
Even though we input sinusoidal signals to INPUT1, we could see nothing with TEST1 of EXCITATION B & SLOW OUT.
We examined the point where the signal reached and could partially understood what happened. 

-For TEST1 of EXCITATION B, U41A(see the attached circuit diagram) didn't let the signal pass.
-For SLOW OUT, the switch of the daughter board, U56A, didn't work, so only the signal passing the path of TP34 could go further. As a temporal solution, we connected TP33 to TP34 with a crocodile clip. Then we could see the signal at SLOW OUT.

Tomorrow...
First, with the signal at SLOW OUT, we will check if the filters on the SLOW PATH work or not.
Second, because we are now suspicious of latch circuits regarding the problems, we will mainly check these.

Circuit Diagram
https://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0035/D1503567/001/D040180-F.pdf