Izumi, Fujii (remotely),

For preparation of the digital-shut-down event, the dc-biases on the following were compensated with stepping/pico motors:
= PRM =
- SF-GAS
- BF-GAS
- OPTIC-ALIGN_PIT

= PR2 =

- BF-GAS
- OPTIC-ALIGN_PIT
- OPTIC-ALIGN_YAW

= PR3 =

- BF-GAS

[Note]
- For these weeks, it looked that the dc control for PR2-SF-GAS was not working (opened). Currently the SF-keystone height is lower than the previous (around Oct. 20th I think) by 1.5 mm though, I did not touch to the PR2-SF-GAS today, since the recent alignment work has done with this lower height condition, and it is wanted to keep this condition for the time being.
- It seems that the stepping motor of the PR3-SF-GAS *might not* be able to pull up the suspension anymore: the motor looked at the edge of the range. The current step is: -1312840. (This depends on the starting position though, I'm 90% sure the it is close to the limit.) Then I stopped moving the motor at that steps today, even though the bias is not close to 0.