MDM Trouble Report for 2018 Jun 04

Telescope: 2.4m
Observer(s): John Thorstensen (Dartmouth)
Instrument: Modspec + echelle

Problem(s) Encountered:
An intermittent fault that occurred May 9 recurred - when Echelle
was read the image looked like a bias without any cosmic rays,
as if the data read from the chip was not making it to the 
recorded image.  This started immediately after Eric left for 
the day, and I spent the interval before dinner trying one
thing after another to fix it (power cycling the Leach board,
pulling out the shutter assembly -- don't try this at home, kids -
and verifying that the shutter was opening, setting Owl to read
a synthetic image -- which it did, and promptly crashed, and 
rebooting mdmarc1 because Owl didn't come up again properly.
In the end I left the Leach board power supply off during 
dinner; and on (weirdly) the third frame I tried after dinner,
it worked!

The problem recurred once during the night (here we go again,
I thought) but this time it started working again as soon 
as I started taking test images.  I lost one exposure and afew
minutes fussing.

As a precaution, I turned off the Leach control electronics
to let them rest during the (hot) day.  I don't know if this
will help, but it's unlikely to hurt.

On other matters, the telescope balked at one innocuous slew,
and the dome -- which was at 270 at the end of the night --
refused to go home until nudged to the righty by the paddle
buttons.  Also, I noticed that in section 2 of the TCS 
documentation, after  set the telescope tracking , there should
be an instruction to  enable the dome following .  Since this is
derived from my instructions, this is probably my fault.

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Submitted on 2018 Jun 5 [5:13:57]