[Kuwahara, Ushiba, Kambara, Michimura]

Although IPC error issue was fixed by Miyakawa-san Kokeyama-san hack, but they insisted that sending signals via cable is naturally more stable.
So, we put a Dsub 9 pin cable (20 m + 5 m) between K1PR0 rack and K1PR2 rack to send a BS oplev QPD signal.
The BS oplev is now powered and whitening-filtered (filter not on yet) at K1PR0 rack, but ADC-ed at K1PR2 rack (ADC 0 IN 29-32).
Attached is the modified schematic.