Introduction
The official guide has been updated and can be found here.
Step-by-step on how to either replace or readjust the L2/R2's rubber components on a dualshock PS4 controller (Model CUH-ZCT1).
Tools
Parts
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Insert an opening tool into the crease where the front and rear panel meet, starting from the outside edge of either handle.
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Gently pry the rear panel off of the front panel until they become partially separated.
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Use the opening tool to separate the panels by releasing the plastic clips around the perimeter of the controller.
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Use your fingers to gently pull the ribbon cable straight out of its connector on the motherboard.
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Disconnect the connector that is connecting the battery to the motherboard. Remove the battery.
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Next pull away the L2/R2 buttons from their positions. L2/R2 should be removed by carefully pulling vertically. Note There are two stubs on the side of it use a prying tool and gently pop them out.
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Examine the controllers rubber guards to see if it needs to be replaced or simply needs to be readjusted. If it is damaged, replace the rubber guard with a new one for the correct model, then, proceed to the next step. If not, proceed to the next step.
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Carefully slide the rubber guard with the area that sticks out more going down into the slot (The crater part of the rubber guard should be in place for the R2/L2 slots; see picture for directions). Once in place, ensure it is snugged and secure.
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The buttons should reset to normal position as it is being depressed.
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Reconnect the battery.
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Connect the strip back into the connector then close the shell starting from the triggers to the handles.
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Screw all screws back into place.
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To reassemble your device, follow these instructions in reverse order.