1. Open the rear upper cover [A].
  2. IM 550F/600F only: Insert a flathead screwdriver into [A] to release a hook of the controller cover [B].

  3. Release the hook by opening the right side of the cover as shown below, and then remove the cover [A] by rotating it in the direction of the blue arrow.

    • Be careful not to damage the hooks on the inside of the controller cover when you remove or install the controller cover.

  4. Insert a flathead screwdriver in the order of [1], [2], and [3] to release three hooks.
    IM 600SRF only: Release the hook [4].

  5. Remove the rear left stay [A].
    IM 550F/600F:

    IM 600SRF:

    • Be careful not to damage the hooks on the inside of the rear left stay when you remove or install the rear left stay.
      IM 550F/600F:

      IM 600SRF:

  6. IM 600F only: Remove the cover [A].
  7. Disconnect the connector of the speaker.
  8. Remove the fax unit [A].
  9. Remove the bracket [A] by sliding it in the direction of the arrow while lifting the stopper [B].
  10. Attach the memory unit [B] to the FCU connector [A].

  11. Reattach the bracket. 

  12. Reinstall the FCU in the interface slot.
  13. Re-assemble the machine.