Dewalt Nailers DCN21PL 2018 Main Electronics Replacement

Before you begin the repair, remove the battery from the device.

Use a T10 driver to remove the four screws securing the bottom half of the casing.

Remove the four T10 screws securing the top half of the casing.

Use a T10 driver to remove the screw securing the magazine to the base.

Pull the magazine down and away to unlatch and release it from the nailer.

Use a T15 driver to remove the framing hook retaining screw.

Remove the hook.

Use your two thumbs to firmly spread the metal hook clamp apart while slowly pushing it forward off the handle.

Use a sharp blade to slice the label underneath the battery mount to disconnect the two halves of the case.

Use a T20 driver to remove the two screws securing the two halves of the case to the front assembly.

Use the provided 3.5 mm hex key to remove the two return system bolts on either side of the nailer.

Grab the end cap and slide the return system assembly out of the back of the nailer to remove it.

Use a small flathead screwdriver in the gap between the two halves of the casing near the trigger to pry the two halves apart.

Use a small flathead screwdriver near the top seam to continue prying the case apart .

Once loose, lift up to remove the right half of the clamshell case.

Remove the plastic lens cover.

Grasp either side of the main circuit board and slowly pull it up and out of the slot in the casing.

Pull up on the trigger lock to remove.

Flip the nailer over.

Remove the remaining clamshell casing.

Use wire snips to cut the small black cable tie securing the four main board wires together.

Pull the white plastic actuator straight up off its axle to remove.

Insert the point of a pick tool into the push-in connector's inlet hole, which has the main board wire plugged into it.

With the pick tool still inserted, pull the red main board wire out of the push-in connector.

Repeat this same process for the black wire and other push-in connector.

Use a T20 driver to remove the following screws:

Two 15 mm-long board retaining screws, one on either side.

Three 10 mm-long motor wire screws.

Slide the board off its guide pin to remove.