1. Remove the controller box. (Controller Box (IM 550F/600F/600SRF))
  2. Remove the bracket [A]. (hook×2)
  3. Remove the IOB (PCB17) [A].

  4. Remove the NVRAM [A] from the old IOB (PCB17) and attach it to the new IOB (PCB17).

    • Install an NVRAM [A] so that the indentation [B] on the NVRAM corresponds with the mark on the IOB (PCB17). Incorrect installation of the NVRAM will damage both the IOB (PCB17) and NVRAM.