When to Replace:

1. Equipment short circuit causes the Marlin board to burn out.
2. Marlin board electronic components are faulty.

Disassembly:

1. Unplug the power cord.
2. Pull down the cover plate on the base and disconnect the two Z-axis motor terminals.

3. Use a 2.5mm wrench to unscrew the 4 foot pad fixing bolts and 5 bottom case fixing bolts, and remove the printer bottom case.

4. Use a cross screwdriver to unscrew the hot bed wire and Marlin board power cord.

5. Disconnect the antenna, USB, button, Y-axis motor, and hot bed thermal signal cable terminals.

6. Use a 2.0mm wrench to unscrew the 5 fixing bolts of the Marlin board and remove it.

Installation:

1. Align the screw holes of the Marlin board with the ground alignment screw holes and tighten the 5 fixing screws with a 2.0mm wrench.
2. Reconnect the antenna, USB, button, Y-axis motor, and hot bed thermal signal cable terminals.
3. Use a cross screwdriver to tighten the hot bed wire and Marlin board power cord.
4. Cover the bottom shell and use a 2.5mm wrench to tighten the 4 foot pad fixing bolts and 5 bottom shell fixing bolts.
5. Insert the two Z-axis motor terminals and cover the cover plate on the base.
6. Replace the QR code sticker by removing the scanned QR code on the back of the right Z-pillar and replacing it with a new QR code sticker.

7. Plug in the power cord and turn on the device.

If the above steps do not resolve the issue, please contact us at us.