[Sheila, Kiwamu]

 For some reason the issue of the picomotor controller box #3 [1] disappeared spontaneously.
We have no idea of what exactly was going on. Keep your eyes on it.

Picomotor Tests
  As planned [2] we tested the slow digital system this morning by plugging a spare controller box directly to the Beckoff chassis with short DB25 cables. With this setup we could drive an in-air picomotor and it didn't show the problem. Then we thought the original long cables that connects the Beckoff chassis and the controller box might be doing something funny. So we tested it by hooking up the in-air picomotor at the front of the original controller box (which is on the top of the IOT2L enclosure) and driving it from the Beckoff through the original cables and controller box. So this is the same configuration as at the time when we had discovered the issue [1] (except we inserted extension DB25 cables to reach the box as ITO2L is put afar). However today we didn't see the issue at all even in this configuration. We tried to reproduce the problem by loosening the DB25 cables (CAB_178 and CAB_179) intentionally but it only made the drive either completely functioning or completely not-moving and hence we were unable to reproduce the issue.

So the issue is gone spontaneously and we quit investigating it for now.

[1] LHO alog 5939 Comments on "HAM3 ISC IR QPDs are likely broken, in-vac cabling error, IO QPD should be OK"
[2] LHO alog 5960 "Test of picomotor controller box #3 : healthy"