Probe Microswitches Replacement

Model [X] AON-M2 [X] AON-M2 2020
Category [ ] Preventive [X] Corrective [ ] Troubleshooting


This procedure gives the instructions on how to replace the two probe microswitches in the machine.


Qty Description Specification
1 Hex Key 1.5 mm
1 Tape Non-Glossy
1 Marker Fine Tip (preferred)

Parts Information

Qty Part Number Description
2 EL-END-SWITCH End Stop Microswitch

Personal Protective Equipment

Qty Description Specification
1 Safety Glasses N/A

Prepare the Machine

  1. Home XYZ.
  2. Lower the Z-axis by 200 mm.
  3. Push the E-stop button.
  4. Wait until the build chamber, build plate and hot ends are at room temperature.

Remove the Microswitches

Remove Wires

  1. With the tape and the marker, tag the two wires (1) that connect to the microswitch (2).
  2. Disconnect the two wires from the microswitch. Remove Fasteners
  3. Use the 1.5 mm hex key to remove the two screws (3) and the two washers (4) from the microswitch (2).
  4. Remove the microswitch from the machine.
  5. If required, do steps 1 to 4 with the other probe microswitch.

Install the Microswitches

  1. Put the microswitch (2) in position on the toolhead.

    Do not tighten the screws too much. The microswitch is fragile. Failure to do so can damage the components.

  2. Use the 1.5 mm hex key to install the two screws (3) and the two washers (4) on the microswitch.
  3. Connect the two wires (1) to the microswitch (2).

    Use the tags identified during the removal to connect the wires to the proper terminals on the microswitch.

  4. If required, do steps 1 to 3 with the other probe microswitch.

Test and Return to Service

  1. Release the E-stop button.
  2. Home XYZ.
  3. Make sure that the microswitches operate correctly. Refer to the microswitches inspection.

Last modified: June 28, 2021