1. Remove the laser unit. (IM 550F/600F/600SRF: Laser Unit, P 800/801: (Laser Unit)
  2. For P 800/801, remove the left upper cover. (Left Upper Cover)
  3. Disconnect the flat cable and harness from the Connect-Left PCB (PCB20) [A].
  4. Disconnect the connector from the left side of the machine.
  5. Release the harness from the harness guides of the laser fan unit [A].
  6. Remove the laser fan unit [A]. (hook×1)
  7. Remove the Connect-Left PCB (PCB20) [A].