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Trouble shooting
A sudden large area of reduced sensitivity
If the area is moving most likely it is a bug or spider.
The only way to remove "a bug with wings" or a spider during
an observing run is to lower the instrument
and remove the offending bug.
Contact staff!!!
No guide star
- Check guide probe limits
The telescope CCD-probe might be vignetting the guide star, if the guide
probe has X > 100000 and Y < 50000.
If you can't see the guide star check the guide-probe X & Y and
choose a new guide star from
here
- Check that the TV-focus is close to 430
- Check the TV-filter.
- Perhaps there are clouds?
- Is the mirror cover open?
- Is the upper hatch open?
- Maybe the lower hatch is vignetting?
Targetoff or imaexam problems
Symptoms: When running imexam or targetoff
- instantaneous crashing and exiting
- when no apparent imexam running, the cursor on ds9 is round instead
of a cross
No signal on the CCD
- Check the pickup mirror position, the status should be "Park"
- Check the TCS focus, it should close to 23230
- Perhaps there are clouds?
- Check the filter positions, perhaps two filters on the beam?
- Is the mirror cover open?
- Is the upper hatch open?
- Maybe the lower hatch is vignetting?
- All pixels values are 0, reduce binning and/or integration time, over exposed image
FASU control
- FASU control does not start
- Check filter position
see point 4)
- You can start fasucontrol by "hand". In a terminal window, type
fasucontrol-SEQ.
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