MDM Trouble Report for 2021 Jun 07

Telescope: 2.4m
Observer(s): Melso/Sitaram (Columbia University)
Instrument: CHaS

Problem(s) Encountered:
After collecting calibration images, we noticed an odd noise source on the detector. 
It is a striped diamond pattern that is symmetric across the detector mosaic for all four 
amplifiers (will send image in email). It is present in bias images. The signal is lower (maybe 5 counts in amplitude) 
so it only became apparent in lower surface brightness images.

We saw in the trouble reports that some (similar?) issues were resolved
by restarting the Head Electronics box. But it was late in the night and we are unfamiliar 
with the exact shutdown procedure so we did not attempt. 

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Submitted on 2021 Jun 8 [4:30:51]