Reference

Robot Butterfly Assembly - Chapter 5/14

Flip the board to back side facing up.

Solder the four 3 pin headers (M): J2, J3, J4, J6. The shroud should be facing up. The long legs should be pointing up.

Using sticky tack can help keep the headers in place while soldering the first set of pads.

Solder the 15 pin socket header (F) and 12 pin socket header (F). The header should be pointing down. Please refer to photos for clarification.

Ensure the headers are fully seated and flush with the PCB before soldering to avoid connection issues.

Solder the 10 pin socket header (F). The header should be pointing down. Please refer to photos for clarification.

Solder the 4 pin socket header (F): J5. The header should be pointing down. Please refer to photos for clarification.

Take a moment to inspect the board and confirm all solder joints are clean and components are seated correctly.