Power on the printer. Navigate to "Function - all" on the touchscreen. The printer starts the homing process.
After the homing process, navigate to "30 mm - Z-axis down" to lower the Z-axis (for twice). Power off the printer.
Loosen the 4 long screws fixed below the heated bed using a 2.5 mm Allen key. Loosen half of the long screws, then unscrew them as there are springs inside the heated bed.
Lift the heated bed and remove the 4 springs.
Unplug the ribbon cables from all the ports on the circuit board of hotbed leveling sensor.
Use a 2.0 mm Allen key to loosen the 4 screws securing the circuit board, then remove the old circuit board of the heated bed leveling sensor.
Prepare the new circuit board of the heated bed leveling sensor. Put it in the installation position by aligning it with the screw holes. Use a 2.0 mm Allen wrench to tighten the 4 screws securing the circuit board.
Plug the ribbon cables into the circuit board according to the size of the ribbon cable's ports.
Put the 4 springs in the installation position by aligning it with the screw holes.
Put the heated bed in the installation position by aligning it with the spring holes.
Pass the long screws below the heated bed. The long screws should pass the center of the spring and turn slightly to secure them.
Secure half of the four long screws using a 2.5 mm Allen key. Then, tighten them completely.
Power on the printer. Navigate to "Calibration - Auto Leveling" on the touchscreen. The printer is ready for use after it is re-leveled.