1. Remove the IOB (PCB17). (IM 550F/600F/600SRF: IOB (PCB17) (IM 550F/600F/600SRF), P 800/801: IOB (PCB17) (P 800/801))
  2. Remove the PSU (PCB18). (PSU (PCB18))
  3. Remove the harness from the harness guide of the bracket [A].
  4. Remove the bracket [A].
  5. Remove the main drive unit [A].