ADDAC System ADDAC213A Assembly Manual page 4

ADDAC213A Assembly Guide
We'll now assemble the Right Module, you can follow the same principles to assemble the Left module.
STEP 1:
Locate pcb and place the 2x5 IDC boxed headers, notice the orientation of the headers below.
After placing proceed to solder it's pins.
STEP 2:
Next place the spacers adding a washer between the pcb and the spacer.
ADDAC SYSTEM page 4