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Can't see pin on video screen

  • Make sure your beamstop is in place! It provides important backlight that allows you to see your crystal. Make sure all your lights are turned on and at full brightness.
  • Push button to rotate 180 degrees. If you see the pin pass by, double click on the screen edge where the pin was last seen, until it reappears. Be careful not to click too many times as the pin may shoot past the crosshairs and you will need to click on the other side to recover. You may use the up and down arrow keys on the interface for this task if you like, but be sure the step size is set to a reasonable number of microns (500 if you have far to move, 30 microns or smaller for fine adjustment).
  • If you did not see the pin during the rotation, then it is too short. Crank the manual crank (moves sample in direction of pin) in the hutch until the pin becomes visible.
  • Try another 180 degree rotate periodically to see if the pin is above or below the screen.

Video screen is frozen

  • Check the centering computer (a1-vid, f1-vid & f2-vid) in the hutch and make sure the screen is not blank. If the screen is blank, you will need to reboot the machine. Pull the power cable out for a few seconds then replace it. The machine should reboot. Log in as specuser. Restart the centering programs.
  • If the centering computer screen is not blank, then Restart the centering programs.

How do I restart the centering programs

  • On the station computer (A1 & F1, or Guideline for F2), open a terminal window and type "stop_centering". Now type start_centering. After a while the centering program on both server and client should be visible.
  • Make sure the number in the focus control box (left) is non-zero! If it is zero, the crosshair may also be off and the camera will not respond to the zoom slider. You will need to type "stop_centering" and "start_centering" again until the interface comes up with a non-zero number in the focus control box. Try this several times if necessary.
  • As a last resort, power cycle the Navatar zoom control box in hutch and restart centering. (call MacCHESS).
  • Always check the angles on the spindle, centering program and ADX. If they do not all agree, then push the "home" button and wait till they synchronize.

How do I restart EVERYTHING (data collection (ADX), rspec & centering)

  • On a terminal window of the data collection computer, type "start_ccd_plus". Please wait, it takes a while. Read the section on "How do I restart the centering system?".
  • To stop everything type "stop_ccd_plus".

I can't see a zoom slider on the left side of the screen

  • Push the X-window resize button twice. This will minimize and re-expand the window. The slider should return.

Control panel is grey, no buttons work

  • Check to make sure the data collection program is running. If not, start up the data collection program and restart the centering.
  • Check to make sure the data collection program is communicating with the phi motor. From "Manual Control" try rotating 90 degrees.
  • If this fails, try restarting the data collection GUI.
  • If still a problem, then contact MacCHESS person on duty for help.

When I click on the video screen, the pin moves the wrong way!

  • Check to see if the angle display agrees with the actual value on the spindle (visible on video screen) and with angle value in ADX data collection software. If the angles do not agree, then push the home button and wait until the process is complete. Should be OK.

Can't rotate the sample, and pin motors will not move when I double click on the screen

  • Check to make sure the data collection program is running. If the program was recently restarted, you will need to restart the centering software. See "How do I restart the centering programs?".
  • Check to make sure the data collection program is communicating with the phi motor. From "Manual Control" try rotating 90 degrees. If this fails, you will need to restart the data collection software. Refer to "How do I restart Everything?".
  • If still a problem, then contact MacCHESS person on duty for help.

Sample will not stay on crosshairs when rotating

  • Make sure the crystal is centered, rotate 90 degrees and center again.
  • The camera may be out of alignment.
  • A trained operator can use the midpoint tool to adjust the crosshairs without removing sample.
  • Best to have a MacCHESS operator check crosshairs with fiber after current data collection is finished. Will require sample be removed.

Richard Gillilan