Heater and thermocouple replacement should take place if the extruder overheats or if the heating is insufficient. These problems are indicated by the firmware messages: “Extruder heating error,” “Extruder temperature is too high” or “Unexpected extruder temperature drop.” Also, if your print has blisters or hanging strands on its surface, you should consider the fact that the heater or the thermocouple may be broken. Sometimes when the nozzle hits the platform the heater and thermocouple also need replacing. But first you need to check the platform connectors and the nozzle for proper functioning..
|NOTE: If you have the heater&thermocouple v1, you also have to replace the hotend and extruder PCB.|
|The following manual shows the M200 repair work. For the M300, these procedures are the same.|
Unloading the Material
If the material is loaded into the extruder, unload the material using the “Material” -> “Unload the material” option in the menu.
Unplugging the Power Cable
Turn off the printer and unplug the power cable.
Wait until the printer – especially the hotend – cools down completely.
Unplugging the Extruder Cable
Unplug the extruder cable.
With a 1.5mm Allen key loosen the two screws that secure the hotend and remove the hotend from the extruder.
Heater and Thermocouple Removal (from the Hotend)
With a 1.5mm Allen key loosen the two screws that secure the heater and thermocouple in the hotend. Then remove the heater and thermocouple.
Extruder Upper Printed Cover Removal
Detach the extruder upper printed cover from the extruder.
Heater and Thermocouple Removal (from the Extruder)
Remove the heater and thermocouple from the extruder block and from the heat shrink tubing. Unplug the cables from the extruder PCB.
New Heater and Thermocouple Assembly (in the Extruder)
Plug the heater and thermocouple cables into the extruder PCB. Put them through the heat shrink tubing and inside the extruder’s block.
Extruder Upper Printed Cover Assembly
Attach the extruder upper printed cover.
Heater and the Thermocouple Assembly (in the Hotend)
Insert the heater and thermocouple into the hotend and firmly tighten the two screws that secure them (using a 1.5mm Allen key).
Make sure that the screws don’t go through the insulation that covers the wires (this can happen if the heater goes too deep into the slot).
|This picture shows the heater inserted correctly.||This picture shows the heater pushed too far into the slot in the hotend.|
Insert the hotend into the extruder and tighten the two screws that secure it (using a 1.5mm Allen key).
Plugging the Extruder Cable
Plug the extruder cable in.
Plugging the Power Cable
Plug the power cable in.