Remove the Controller
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Turn off the chair's power. Unplug the chair from the outlet.
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Peel off the label covering the controller with the utility blade. You'll see three screws securing the controller to the iJoy.
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Unscrew each screw with the Philips-head screwdriver. Keep the screws together and set them to the side.
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Slide the flat-head screwdriver under the outer edge of the controller. Pry the controller up. Keep prying until the controller is lifted up and out of the iJoy's armrest. Pull the controller away from the massage chair. One side of the controller is lifted up at this point.
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Disconnect the tabs on the inside edge fo the chair. They keep one side of the controller connected to the chair's armrest. Now, remove the controller from the armrest.
Install New Controllers
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Align the new controller's connectors to the connectors on the inside of the armrest. Push the outer edge of controller down into the armrest. Make sure the controller is fitted securely inside the armrest.
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Insert the three screws into the new controller. Tighten each screw using the Philips-head screwdriver.
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Place the controller label on top of the controller. Press down on the label using your fingers. Make sure it sticks to the controller.
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Plug the iJoy into the outlet. Turn the power button. Check the controller and ensure it's functioning properly.