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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.
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Turn the controller over.
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Remove the three 6mm screws from the back.
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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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Blow out dust on the number pad sensors with compressed air.
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Wipe the sensors clean with a cloth dabbed with alcohol.
 
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Use a spudger to remove the top frame.
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Take off the plate.
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Remove the rubber buttons.
 
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Pull the circuit strip through the new space.
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Realign the top and bottom of the controller.
 
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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 back into place.
 
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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