MDM Trouble Report for 2017 Aug 11

Telescope: 1.3m
Observer(s): Eric Galayda (MDM Observatory)
Instrument: Andor (Direct)

Problem(s) Encountered:
While running through systems with the next scheduled observer in order to start
bringing him up to speed on using the 1.3m, the x-stage failed on the guide probe
assembly.  Checking the log, it appeared that both limit switches were registering as
tripped.  Pulled the instrument & FW and removed the MIS bottom plate.  Found the 
lower-limit (0) limit switch to have essentially disintegrated.  Not sure what happened
but it was in many, many pieces.  My best guess is that the switch failed and the 
guider stage squished the switch.  Pulled the remaining pieces and found a spare to
install.  Installed and tested.  All is well again.  Put everything back together.  Will order
some spare switches (I currently have two) considering how many are in each MIS.

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Submitted on 2017 Aug 14 [11:51:10]