Locate the white plastic Assembly Cap part.

Make sure that the flat side of the Assembly Cap is facing up when orienting it relative to the top surface of the Control Board as shown.

Position the Assembly Cap above the eleven components P1-7 and D1-4 and slide it down onto them.

The Assembly Cap should rest flush up against the Assembly Template with no gaps between them.

Now solder all of the loose through-hole components in place. There are a total of 26 components with 92 solder joints.