Step 5. Solder Headers

Retrieve parts bag #2 and empty it out.  Set aside two of the 2x5 pin headers and one of the 2x10 headers aside since they are soldered later on the DRO-550 board.  Also set aside the long 1x20 pin header since it is soldered later on the LCD module.  Now solder two of the 2x5 pin headers at positions J6 and J3 in the middle of the board.  Next, solder one 2x10 pin header to position J1.

The last header is a 20 pin MDF7 header which is what the LCD module will connect to.  It must be soldered at J2 with the U-shaped contacts on the bottom and the black plastic ears pointed up.  Look at the picture at left to verify the proper orientation before soldering it in place.