Introduction
The number pad, while not used in many games, can become unresponsive over time due to dislodged/dirty sensors. Reseating and cleaning them can improve number pad responsiveness of your Atari 5200.
Tools
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Turn the controller over, exposing the three screws on the back (marked by the orange circles). Use a 6mm screwdriver to remove these screws.
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Carefully slide and pull the two parts of the controller shell apart, exposing the innards.
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Take out the rubber button module of the number pad.
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With access to the number pad sensors, use compressed air to blow out dust.
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Wipe the sensors clean with a cloth dabbed with alcohol.
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Return the buttons to the top of the controller.
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Snap the frame back into place.
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Screw the screws.
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To reassemble your device, follow these instructions in reverse order.