ONLY AUTHORIZED PERSONNEL ARE ALLOWED TO REMOVE THE POLARIMETER

Removing the polarimeter

1. Login to honolii as user lriseng
2. Start the script to install the polarimeter by selecting Engineering > Polarimeter > Remove polarimeter. When the following query appears:

   Should I open the trapdoor, insert direct mask, and power off
   the red polarimeter encoder so that you can remove
   the module? (y/n) [y]: 

   press Enter to continue. The script will prepare the instrument for removal of the polarimeter module, and tell you when to proceed.
3. Rotate LRIS to the fill position (if it is not already there) by following these steps:
   • Verify that power to the AAA is on at the MCP.
   • In the AAA at Panel A2:
     • Switch CASS to ENABLE.
     • Switch MODE to LOCAL.
     • Switch DRIVE POWER to ON.
   • Hold down CASS CW switch to rotate to desired position.
   • Switch DRIVE POWER to OFF
4. Remove LRIS to the Cassegrain platform following the module servicing procedure.
5. Open side access door; this is on the right side of LRIS when viewed from the front.
6. Using a 3/16 ball driver, reach through the trap door and loosen, but do not remove, the four allen screws from the front of LRIS , (two screws on top and two on bottom) that reference the polarimeter. Alert: the screws are not captive!You may have to rotate the polarimeter filter wheel to get to the top right screw.
7. Disconnect the four cables through the side access door.
8. Position yourself inside the module handler facing LRIS rear, with the polarimeter storage box at your feet. Be careful not to touch the beamsplitter on the back of the baseplate, the filter wheel in front, or the field lens towards the rear of LRIS.
9. Remove the polarimeter through the side access door using the two handles and put it in the storage box.
10. Tighten the four screws that define the polarimeter baseplate against the LRIS frame in front of the field lens.
11. Close the inner hatch door and using a 7/64 ball driver, secure with two allen screws.
12. Close the outer door securely.
13. Return to honolii and press Enter in the window running the script to continue.
14. At the prompt:

    OK.  At this point, the polarimeter should be removed.
    Should I close the trapdoor now? (y/n) [y]:

    press Enter to close the trapdoor and continue.
15. The script will now do the following:
    • Update the image headers to remove polarimeter keywords.
    • Restart the low-level software which writes images headers so that the updated header file is re-read.
16. When done, the script will print:

    ------------------------------------------------------------------------
                                      SCRIPT DONE                               
    ------------------------------------------------------------------------

    Press Enter to close the window.

If there are no other LRIS configuration changes...

1. Install LRIS in the telescope following module servicing procedures.
2. Select Engineering > Checkout LRIS in LRIS workspace menu. See the Checkout Procedure .
3. Press y to start the checkout script.
4. Note if the script has any problems executing.
5. Select logout from the FVWM background workspace menu.
6. Update the summit activities instrument schedule on the web.