MDM Trouble Report for 2020 Feb 04

Telescope: 2.4m
Observer(s): Rupert (MDM)
Instrument: OSMOS/B

Problem(s) Encountered:
Focus got stuck again. Noticed it during evening twilight when
I tried to run the focus4k prospero routine. No means of changing
focus was able to pull it out. Shut everything down, including
the TCS computer and chassis, and still no change. Previously,
the focus would seem to come back on its own, but it did not
this time. Noticed that there were some unusual noises in the
dome. Eventually pinpointed it to the focus motor. It seemed
to go away when I closed the TCS software, then start again when
I reopened it and it was doing its temperature compensation.
Decided to unplug the focus motor from the back of the chassis
and observe at the last focus (5269). It varied from 5230-5310
which just happened to be fine for spectroscopy tonight. Lost
about an hour.

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Submitted on 2020 Feb 5 [6:14:41]