For this delicate operation you need an experienced TIO

(1) Call the mechanics, they will dismount the WFI with tools stored in the fiber room(Integration Room).

• Put Amplifiers and the Hydraulic pumps ON.
• Reboot the TCS VME.
• Start Up the TCS.
• Put the telescope in the Zenith position. Use the TCS GUI.

(2) In the Dome:

• Follow up the Safety instruction for working the Dome Area. Don't forget your Helmet and your safety shoes.
• Put the telescope lock pins IN.
• Let the mechanic team remove all the screws from WFI chassis.
• Remove the nitrogen gas hose. No others cables or hoses must be disconnected.
• The WFI must be mount over the carriage and attach to it (take care with cables and fibers).
• Take out the Grism Unit from the storage room, call for help it is necessary.
• Be sure that the protective shutter is close.
• Take care with your fingers, don't talk or smoke over the Grism surface.
• Put the Grism Unit directly over the central axis of the instrument.
• Be sure that the aligment of the grism is Ok (see if the marks are colineal).
• Put all the Grism screws around the flange.
• Lift the instrument and reinstall the screws that connect the instrument to the telescope.
• Disconnect the carriage from the instrument.
• Now the Grism is installed in the instrument.
• No telescope balance or other adjustment it is necessary.
• Put the telescope lock pins OUT.
• Remove all the objects or carriages around the telescope.
• Store the special tools in the fiber room (Integration Room). (No other tools or spare are available)