The Jxx are referenced on page 3 of the PDF - https://downloads.antrica.com/UAV-Encoders/ANT-1773/Application-Notes/ANT-1773_Pinout.pdf

J42 - The power connector on the board is a molex 1040860410 (IllumiMate 1.25mm Pitch Wire-to-Board Header, Single Row, 4 Circuits) and should mate with the wire / cable part molex1040850400 (IllumiMate 1.25mm Pitch Wire-to-Board Crimp Housing, Single Row, 4 Circuits, Natural)


Please consult with you connector provider to confirm the mating part numbers are correct. The board part numbers are correct.