Troubleshooting

Sometimes cameras won't start, or stop running, or the interface crashes. Things you can try (roughly in order):

• Use stop and kill buttons Try the stop button then the kill button, then try start.

• Restart the interface Kill the camera interface and to restart it.

• Check that repeats field is set to 0 if using multiple cameras If the interface controls more than one camera, then repeats must always be 0 (unless in focus mode - eg during the polarimetry calibration).

• Check and maybe restart proxy programs Proxy programs must be running on each of the active camera computers. Proxys should be started at boot time, but sometimes they crash and need to be restarted.

  ssh camera#
  cd obs/cameras
  ps aux | grep proxy

  If no proxy is running then (as obs)

  nohup ./bin/proxy $>$& proxy.log &

  If there exists a proxy process but you think it may have crashed, then

  kill -9 pid_number

  before restarting with the above command.

• Kill old camera processes Sometimes the proxy attempts to start the camera software while an old version is already running. Depending on the type of camera connected, the process will have a different name.

  Megaplus I = hitachi
  Megaplus II = phx
  Sarnoff = sarn

  Use the following to find and kill camera processes

  ps aux | grep process_name
  kill -9 pid_number

• Check that the server program is running The server program may have crashed. To kill and restart the server see section 5.

• Check Sarnoff selection width is not too large Check that your frame selection window (green box) is not too large, as this can crash the Sarnoff software. A box size of 200x200 is ok, larger than 400x400 is risky.

• Reboot If you lose all hope, try rebooting the camera computers.

SOUP problems:

• SOUP laptop computer crashes Restart it and start the SOUP program see section 3.4.

• SOUP camera fails when SOUP enabled on interface Try resetting the power box for the LC crystals (cupper box behind the SOUP filter).