Before replacing the thermistor, turn off the power of the machine before replacing it.
1、Remove the small drawer box located on the left side of the printer. (Neptune 4 Plus do not have the drawer box.
2、Use the H2.0 Allen wrench to loosen the 20 screws fixed on the bottom cover.
3、Open the bottom cover from the side and unplug the cable connector of the motherboard cooling fan.
4、Use a pair of diagonal pliers to cut off the 6 pieces of cable tie securing the ribbon cables.
5、Unplug the wire ports of each branch of the heated bed cable from the motherboard.
6、Use a Phillips screwdriver to loosen the two screws of the heated bed module port and remove the two heated bed cables.
7、Loosen the six leveling knobs under the heated bed. Unplug the Y-axis accelerometer cable.
8、Remove the PEI plate. Remove the two screws in the center of the heated bed using an H2.5 Sllen key. Take out the whole hetaed bed upwards.
9、Cut off the cable ties securing the ribbon cables using a pair of diagonal pliers.
10、Loosen the two screws holding the heated bed cable fixture using an H2.0 Allen wrench. Remove the heated bed wire fixture.
11、Tear off the tape wrapped around the heated bed wires (the tape is reusable). Pull out the thermistor cables separately from the braided network tube.
12、Cut the insulation cotton along the thermistor row using a utility knife.
13、Tear off the high temp tape and remove the thermistor of the heated bed.
14、Cut the insulation cotton using a utility knife. The thermistor needs to be installed on the heated bed of the aluminum substrate。 Do not directly attach it to the insulation cotton.
15、Put the new thermistor in the installation position and secure it using high-temperature tape. Glue the split insulation cotton using high-temperature tape.
16、Thread the heated bed thermistor wire into the braided network tube and wrap the black tape around the end of the braided network tube.
17、Install the heated bed fixture amd tighten the 2 screws using a 2.0 mm Allen key.
18、Put the heated bed cables in the fixture and secure them using two cable ties.
19、Align the spring hole position and insert the six screws of the heated bed into the six springs.
20、Tighten the two set screws in the center of the heated bed using a H2.0 Allen key.
21、Place the PEI platform. Insert the Y-axis accelerometer cable and tighten the six knobs under the heated bed.
22、Put printer on its side. Pass all the wires of the heated bed through the wire holes.
23、Insert the ribbon cables of the motherboard cooling fan into the TB0 port.
24、Plug the accelerometer cable into the Y port of the motherboard.
25、Insert the heated bed cable into the heated bed module port and tighten the two set screws using a Phillips screwdriver.
26、Sliding the heated bed to ensure that the heated bed cable has enough length for the heated bed to move. Fix the internal cable using five cable ties.
27、Remove the bottom cover and align it with the mounting position.
28、Plug the motherboard cooling fan cable into the FAN6 port of the motherboard. Tighten the 20 screws fixed on the bottom cover suing the H2.0 Allen key.
29、Install the drawer box located on the left side of the printer. (Neptune 4 Plus do not have the drawer box.)
30、Turn on the printer, test the printer hot bed heating function is normal,. After releveling the printer, it can be used normally