1. Remove the rear cover. (Rear Cover)
  2. Remove the controller box cover [A] (×9).
  3. Remove the plate [A] (knob screw×1).
  4. Remove the SD card/LAN guide [A] (hook×3).
  5. Remove the “L-shaped” bracket [A] (×4).
  6. Slide off and remove the controller board [A] (×4).
  7. Remove the rails [A] and two NVRAMs [B].

When installing the new controller board

  1. Remove the two NVRAMs from the old controller board.
  2. Install the removed two NVRAMs on the new controller board.

    • There are two NVRAMs, "1" [A] and "2" [B]. Install each NVRAM in the corresponding slot as shown in the photo below.
    • Install the NVRAMs so that the mark [C] on the NVRAM is on the upper side when the controller board is installed.

  3. Replace the NVRAM if the NVRAM on the old controller board is defective.

  • Keep the NVRAM away from objects that can cause static electricity. Static electricity can damage NVRAM data.
  • Make sure that the NVRAM is correctly installed on the controller board.