MDM Trouble Report for 2010 May 3

Telescope: 2.4m
Observer(s): Skinner, Spellmire, Thorstensen (Dartmouth)
Instrument: modspec + echelle CCD

Problem(s) Encountered:
The telescope control somehow got wedged into a state in which it
was continually drifting east at the guide rate.  This first
manifested in an auto-set that did not complete and would not 
clear by the usual method.  Julie went as far as going to the
zenith and hitting the red stop button, but the problem persisted
at which point she woke up John; we then cleared the problem by
shutting down the TCS computer (using the orderly procedure
described in the lighting shutdown sheet) and powering it off,
together with the TCS power supply.  Everything was fine when 
it came back up, and the problem did not recur.

I (John) had never seen this behavior before.

Before shutting down the TCS we closed the mirror cover; while 
it was closed, the AC computer was flashing a complaint about 
bad sensor data (same as last night).  Oops, it just did it 
again (sorry, Britney) -- 

SYSTEM DISABLED -- Sensors appear to be malfunctioning.

So, it looks like we still have this intermittent problem.

------------------------------

Submitted on 2010 May 4 [5:46:00]
NOTE: This trouble report replaces the previous report for 2010 May 3