The MC (Machine Controller) board fan is a 5V fan for cooling the Machine Controller board.
1. Should a warning come up on the screen, such as “The motor driver is overheating. Its radiator may be loose, or its cooling fan may be damaged” having checked that the connections are OK;
2. Abnormal noise from the fan.
Prior to commencing with the process in this guide, please make sure the machine is switched off and that the AMS along with the PTFE tube and filament buffer are removed
Undo the screws at the back of the printer as marked below. There are a total of 14 screws to undo, 10 of them in the first image and 4 in the second image as shown below.
To remove the rear cover, it is important to first pull the left side so that the left belt tension port doesn't get in the way, followed by the right side. Push the PTFE tube outlet inwards to free it from the cover.
Undo the screws located at each side of the excess chute. once done, take out the excess chute. Some printers have three screws to secure the excess chute, while some only have two; please refer to your unique situation.
Note: For some versions, the heat bed cables are fixed to the bottom of the excess chute with a buckle, do not use too much force when taking off the excess chute.
Two screws case:
Three screws case:
Locate the MC board which is situated on the right side of the back of the machine and disconnect the 2 motor cables from it located at the bottom (note: The left one is the cable for motor Z).
Undo the 2 screws holding the heatsink in place, and the remove the heat sink.
Disconnect the MC board fan's cable from the connector end, and pull the fan outward slowly. The fan is held in place with AB glue so a slight bit of force might be required to pull the fan out, or a hair dry will be needed to heat up the glue before removing the fan.
Prepare a new MC board fan, and attach the used double-side tape that was removed from the old fan. If the tape was torn, you can use standard double-sided adhesive tape.
Insert the fan in the allocated slot with the adhesive tape facing inward, the label of the fan should face to the MC board.
Route the fan cable along the MC board as shown below, and then connect it to the MC board.
Place the heatsink back on the MC board and secure it with 2 screws.
Re-connect the 2 motor cables to the MC board, taking note that the connector on the left is the one for the Z motor cable.
Install the excess chute by sliding it back in its position, pay attention to the protruding tabs on both sides of the chute. Finally, secure it in place with 2 screws at each side of the top of the chute.
First, pass through the tube bracket and then secure the right side of the back cover past the right belt tensioner as shown below, followed by the left belt tensioner.
Screw the back panel back on. Take note of the different types of screws (10 and 4) used as pointed out previously
Connect the power cord and turn on the power. Run a Device self-test operation as shown below and if no errors occur, the replacement was successful.
Should you come across any issues, first retrace your steps and check all connections to try again. If problems persist, contact the service team for further assistance.