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This guide shows how to remove or replace the main board electronics in a Dewalt DCN21PL Nailer.
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Before you begin the repair, remove the battery from the device.
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Use a T10 driver to remove the four screws securing the bottom half of the casing.
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Remove the four T10 screws securing the top half of the casing.
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Use a T10 driver to remove the screw securing the magazine to the base.
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Pull the magazine down and away to unlatch and release it from the nailer.
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Use a T15 driver to remove the framing hook retaining screw.
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Remove the hook.
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Use your two thumbs to firmly spread the metal hook clamp apart while slowly pushing it forward off the handle.
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Use a sharp blade to slice the label underneath the battery mount to disconnect the two halves of the case.
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Use a T20 driver to remove the two screws securing the two halves of the case to the front assembly.
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Use the provided 3.5 mm hex key to remove the two return system bolts on either side of the nailer.
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Grab the end cap and slide the return system assembly out of the back of the nailer to remove it.
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Use a small flathead screwdriver in the gap between the two halves of the casing near the trigger to pry the two halves apart.
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Use a small flathead screwdriver near the top seam to continue prying the case apart .
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Once loose, lift up to remove the right half of the clamshell case.
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Remove the plastic lens cover.
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Grasp either side of the main circuit board and slowly pull it up and out of the slot in the casing.
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Pull up on the trigger lock to remove.
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Flip the nailer over.
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Remove the remaining clamshell casing.
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Use wire snips to cut the small black cable tie securing the four main board wires together.
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Pull the white plastic actuator straight up off its axle to remove.
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Insert the point of a pick tool into the push-in connector's inlet hole, which has the main board wire plugged into it.
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With the pick tool still inserted, pull the red main board wire out of the push-in connector.
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Repeat this same process for the black wire and other push-in connector.
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Use a T20 driver to remove the following screws:
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Two 15 mm-long board retaining screws, one on either side.
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Three 10 mm-long motor wire screws.
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Slide the board off its guide pin to remove.
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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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