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Removing the LNC and the Circulator

Before removing the LNC and the circulator/waveguide assembly, you must remove the antenna position sensor board (Removing the Antenna Position Sensor Board).

In most cases, you must remove the magnetron in order to access one of the screws that secure the LNC and the circulator/waveguide assembly to the antenna rotary joint (Removing the Magnetron).

The LNC and the circulator/waveguide assembly are secured to the antenna rotary joint by the same set of screws, so you must remove them both at the same time.

  1. Remove the adhesive tape securing the LNC coaxial cable and the LED status light cable to the LNC.
  2. Disconnect the LNC coaxial cable and the LNC data cable from the LNC.
  3. Supporting the circulator/waveguide assembly with your hand, remove the bottom two screws 1 securing the circulator and the LNC to the rotary joint.

    LNC with callouts
  4. Carefully slide the circulator/waveguide assembly to the right, away from the LNC, and remove it from the housing.

    The LNC will remain supported by one screw on the left side of the housing.

  5. Supporting the LNC with your hand, remove the screw on the left-hand side 2, and remove the LNC from the housing.
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November 2025
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