Problem sem4160 SNF 2009-04-20 22:14:23: can't see anything

rostam at rostam at
Mon Apr 20 22:14:24 PDT 2009

after inserting the sample and closing the valve, there was a hissing sound. I unloded the sample and loaded again the hissing sound stopped.
However, I couldn't see anything. even at highest brightness the image is completely dark.

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