MDM Trouble Report for 2012 Dec 28

Telescope: 1.3m
Observer(s): Gaidos (University of Hawaii)
Instrument: 4K

Problem(s) Encountered:
Focus was supposed to be at 815 (or perhaps 850) after restart of TCS and 
homing of everything the previous day.
However, image of bright star showed telescope very far from focus 
(very large image of primary instead)
Tried homing focus (home button, select focus drive, select apply)
Instead of moving the focus, the focus setting reset from 815 to 0
There was no motion of the focus drive.
Tried setting focus to 815.  This moved the focus a long ways,
but image was still far out of focus.  Tried moving back to 700.
This command was ignored.
Discovered that (1) all commands to set focus to a smaller setting are ignored.
and (2) the focus home command does not actually home the focus, but resets
the focus display to 0 mils.  The command it executes to do 
this is of the form  home sec_hit=-XXX focus  where XXX is some number
like 460.  
This was repeatable.  
Could not find documentation on focus beyond instructions
on commanding it to home using buttons, so out of concern,
stopped experimenting and shutdown at 3:30 AM.


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Submitted on 2012 Dec 28 [3:54:26]