Tools Required: Knife, Phillip's head screwdriver, pliers
- Make sure the sprayer is off and the battery has been removed. Taking your screwdriver, unscrew the cover plate. Loosen the strain relief fitting and set the cover plate aside.
- Unscrew the battery holster and detach it from the sprayer tank. Using your fingers or a pair of pliers, gently remove the wires connected to the battery holster.
- To access the wires underneath the pump, loosen the screws securing the pump to the tank.
- Using the knife, carefully slice the protective tape surrounding the pump-to-circuit board connection. Disconnect the circuit board from the diaphragm pump and slide the wires out from under the pump.
- Disconnect the circuit board from the power dial in the same fashion by slicing the protective tape.
- Follow the previous steps in reverse in order to connect the replacement circuit board. Connect the power dial, connect the pump and slide the wires under. Secure the diaphragm pump back to the sprayer tank.
- Attach the wires to the back of battery holster while taking note of the color of the wires. Red = positive; black = negative.
- Place the battery holster back into position and secure it.
- Insert a battery into the holster and test it. If the sprayer starts up normally, you may close it up.