Lift the front cover of the printing head to remove it. Unplug the port of the ribbon cables of the model cooling fan.
Use a 2.0 mm Allen wrench to loosen the 4 screws securing the middle housing of the print head.
Press downward the tablet of the connector using a pair of tweezers, then unplug the input tube.
Unplug the ribbon cables of the ceramic heating plate and the thermistor.
Use a 2.0 mm Allen wrench to loosen the 4 screws securing the gearbox of the extruder assembly. Then, remove the gearbox of the extruder and the nozzle assembly.
Unplug the port of the ribbon cables of the heat break cooling fan. Use a 2.0 mm Allen wrench to loosen the screw securing the heat break cool fan assembly, then remove the heat break cooling fan assembly.
Use a 1.5 mm Allen wrench to loosen the 2 screws securing the cable port of the print head. Then, unplug the connecting cables of the print head.
Use a 2.0 mm Allen wrench to loosen the 3 screws securing the back cover of the printer, then remove the print head's back cover.
Unplug the ribbon cables of the model cooling fan and port of the extruder motor on the PCB of the print head.
Use a Phillips screwdriver to loosen the 3 screws securing the PCB of the print head.
Use a 2.0 mm Allen wrench to loosen the screw below the adpater board. Press the adpater board slightly to seperate the board.
Remove the old PCB of the print head. Use a 2.0 mm Allen wrench to loosen the 2 screws securing the extruder motor.
Rotate the extruder motor at a slight angle, then remove the old extruder motor from the front of the printing head.
Prepare the new extruder motor. Rotate it at a slight angle, then put it in the installation position.
Use a 2.0 mm Allen wrench to tighten the 2 screws securing the extruder motor.
Prepare the PCB of the print head, then put it in the installation position by aligning it with the screw holes.
Insert the adapter board into the PCB of the print head by aligning the adpater board with the holes of the ribbon cables.
Use a Phillips screwdriver to tighten the 3 screws securing the PCB of the print head.
Use a 2.0 mm Allen wrench to tighten the screw securing the adpater board.
Plug the ribbon cables of the model cooling fan and the extruder motor into the port of the PCB of the print head.
Prepare the back cover of the print head. Put it in the installation position by aligning it with the screw holes. Use a 2.0 mm Allen wrench to tighten the 3 screws securing the back cover of the print head.
Insert the cables of the print head. Use a 1.5 mm Allen wrench to tighten the 2 screws securing the cable port of the print head.
Prepare the new heat break cooling fan assembly and put it in the installation position by aligning it with the screw holes. Use a 2.0 mm Allen wrench to tighten the screw securing the heat break cool fan assembly.
Insert the ribbon cables of the heat break cooling fan into the adapter board port.
Prepare the new gear box of the extruder and the nozzle assembly. Put them in the installation position by aligning them with the screw holes. Use a 2.0 mm Allen wrench to tighten the 4 screws securing the gearbox of the extruder assembly.
Insert the ribbon cables of the ceramic heating plate and the thermistor into the port of the adapter board.
Insert the input tube into the connector.
Put the middle housing of the printing head in the installation position by aligning it with the reserved groove of the cutter lever and screw holes. Use a 2.0 mm Allen wrench to tighten the 4 screws securing the middle housing of the print head.
Prepare the front cover of the print head. Plug in the port of the ribbon cables of the model cooling fan, then organize the ribbon cables. Put the front cover of the print head in the installation position by aligning it with the positioning holes.
Plug in the power cord and power on the printer. Touch "Function" on the touchscreen to enter the Prepare interface. Set the temperature of the nozzle to 220 ℃.
Touch "Extrude" on the touchscreen. Observe that the nozzle can extrude the filament successfully.
The printer is ready for use after it is re-leveled.