Step 4: Locate and carefully desolder and remove the Q400 transistor and solder one wire to the single side pad of where the transistor once was. Step 3: Remove the eight screws on the bottom PCB to free it from the transmitter housing. They are located at the top corners of the transmitter and in the bottom corners of the battery bay. Step 2: Remove the four Philips head screws holding the housing together. Step 1: Pull the battery cover off of the transmitter and remove battery.