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Thermo Fisher Scientific

Image corrector A1 tuning didn’t work well

Issue

Image corrector A1 tuning didn’t work, no response in FFT.

Environment

Titan 80-300

Resolution

These are possible resolutions for the issue:

  • Set image to under-focus before start C1A1 tunning

Cause

These are possible causes for the issue:

  • Image was set to overfocus.

Details

  1. Found beam after replace Power Supply, but C1A1 tunning was abnormal, A1 tunning didn’t work due to there was no response in FFT. 
  2. Restart TemServer, problem still observed.
  3. Power cycle, problem still observed.
  4. Set all exported elements to zero- didn’t work.
  5. With remote video support auto A1 tuning even become worse after we manually finished the A1 tuning. 
  6. Image focus was set to overfocus by FSE that is the root cause for this issue, after set it to underfocus C1A1 working normally.

Note: It’s difficult to confirm the image status with C1 which I highlighted in Yellow and FFT, C1 always show “–” with both over and under focus. To set image in correct under focus we should turn focus know counterclockwise from in focus status, or confirm FFT while we turn focus knob, if FFT was expanded with focus knob clockwise tuning that means image is in under-focus now.

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