The extruder upper fan is responsible for cooling all components of the extruder, and thus prevents the whole unit from overheating. If you notice lower quality of prints or insufficient extrusion and shortages of materials in the structure of your model, at first check the extruder upper fan for proper operation. If the fan blades don’t spin, it should be replaced with a new one. Also, the error message #140 refers to the fan’s failure. This manual shows how to carry out the replacement.
Unplugging the Power Cable
Turn off the printer and unplug the power cable.
Opening the Top Door
Open the top door.
Extruder Front Cover Removal
Remove the extruder front cover.
Unplugging the Extruder Upper Fan Cable
Unplug the extruder upper fan cable.
Extruder Upper Cover Removal
Remove the extruder upper cover.
Unscrewing the Extruder Upper Fan
Unscrew the two screws securing the extruder upper fan and remove the screws.
Extruder Upper Fan Removal
Separate the extruder upper fan from the extruder.
Extruder Upper Fan Installation
Install the extruder upper fan in its place and put the cable in the gap.
Securing the Extruder Upper Fan
Secure the extruder upper fan with the two screws.
Extruder Upper Cover Assembly
Attach the extruder upper cover to the extruder.
Extruder Front Cover Assembly
Attach the extruder front cover to the extruder.
Closing the Top Door
Close the top door.