The Coude Echelle Spectrographs (Expert Information)


Appendix C10: Error Recovery

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Occasionally, things will go wrong. Here is a brief list of some of the potential problems and some suggestions for how to escape from them without exercising the ultimate sanction of shutting down and reloading the system.
 
Problem Solution
No light. Check that:
  • the coude 3, 4 and 5 mirror covers are open
  • the east coude hatch is open
  • the TV mirror position is correct
  • the slit or lamp filters are appropriate
  • UHRF ThAr is in the correct position
  • the shutter is switched to CCD (rather than echelle)
  • the Hartmann masks are open
  • the UCLES collimator and grating covers are open
  • the configuration was successful
  • The mechanism movement
    fails or sticks.
    Try using the CANCEL command to cancel it and re-issue the command. If this fails, reboot the SYNTEL (support staff only) then reload the D-task: 
    LOAD ECH_ICL:ECHELLE
    (possibly not necessary but recommended).
    The system appears to 
    hang.
    Type CTRL-C, which should always return safely to the ICL prompt.
    You get a traceback from a task. If you know which task it is, try:
    LOAD ECH_ICL:task
    where task will be one of: 
  • ECHELLE - the D-task, including all mechanism commands
  • UCLES_A - the A-task, including USE, LIST, CENTRE, ISET
  • UCLES_C  - the C-task, including PIXELS, OFFSETS, FOCPARS, ARGS, IMAGE, ICUR, ROTCEN
  • UCLES_CD - the CD-task, including DISPLAY, CONFIGURE, TRACKPA, VERTICAL
  • (See UHRF and ADAM)
    Something that did work stops working. Try the same fix as above. 
    If this fails, try CTRL-C and repeat and/or try: 
    KILLW task
    You get the error message: Failed to get Telescope Position Check the CAMAC ACCESS ARBITRATOR. If light 0 is on steadily (rather than flashing) CAMAC has hung, so press SYSTEM INIT on module 22 of the CAMAC crate. If the CCD readout does not complete, you might try RECOVER XMEM and RECOVER CCD from observer, but the data are probably lost.
    If all else fails If the fixes for the UCLES problems don't work, shutdown the system with SHUTDOWN or CTRL-Y and start again with UCLES. You shouldn't need to log out, but do so if problems persist. 


    Ray Stathakis (ras@aaoepp.aao.gov.au)
    Last Update: 17 April 2000