<div dir="ltr">Hi David,<div><br></div><div>We had this issue on our Talos Arctica and replacing optics boards did not fix the problem. It was finally solved by upgrading the firmware of the optics boards from 2.0.3 to 2.0.7. Apparently the correct firmware was never pushed to the boards after a prior software update.</div><div><br></div><div>There is a coil calibration procedure that had to be re-done as well.</div><div><br></div><div>Restarting the TEM server doesn't switch the FEG off as others have pointed out. However the gun lens trick mentioned by Mike Strauss doesn't appear to work for us after updating the microscope software to 1.15. We have to do a TEM server restart to reset the Falcon dose protector.</div><div><br></div><div>Best,</div><div><br></div><div>Andrea</div><div>The Francis Crick Institute</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jun 17, 2020 at 10:49 PM Morgan, David Gene <<a href="mailto:dagmorga@indiana.edu">dagmorga@indiana.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p>Hi,</p>
<p><br>
</p>
<p> We have a chronic problem with our Talos Artica sending out "optics board degraded" error messages. There is an easy reset for this, except that at least for our system, the Falcon camera can't be used after resetting the optics board unless one also
does a microscope server reboot. Which my engineer says means I need to shut down and restart the FEG. So it's not an easy fix.</p>
<p><br>
</p>
<p> This seems to happen once every few weeks, maybe once per month. Except that yesterday, it happened three times within about two hours. [I reset the optics but didn't use the Falcon, for those of you wondering how I could restart the FEG that quickly...
] It didn't happen today at all, so the error really seems to be happening randomly.<br>
</p>
<p><br>
</p>
<p> My engineer says that the most likely cause of this is interruptions to the chilled water supply, but I have not been able to identify any sort of problem with flow, chilling, etc. Has anyone else seen similar chronic issues with this error?</p>
<p><br>
</p>
<p> Thanks for any advice you can offer.<br>
</p>
<p><br>
</p>
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David Gene Morgan<br>
Electron Microscopy Center<br>
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IU Bloomington<br>
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812 856 3221 (3200)<br>
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