How to change a Thermocouple

  1. Turn off the MakerBot Replicator 2
  2. Gently turn the machine onto its left side (your left as you face the machine)
  3. Unscrew the hex screws holding the metal mother board cover in place and remove this cover
  4. Now locate the gold wire inserting into the green block in the bottom right hand corner, labelled "Red" and "Yellow" 
  5. Unscrew the holding screws and remove the 2 ends of the wire.
  6. Under the extruder there are 2 screw which hold the extruder to it's plastic mount. Unscrew these 2 screws to remove the extruder.
  7. Leave the thermocouple connected to the heated block and pull the thermocouple wire through the sheathing so the whole wire is free to turn.
  8. Unscrew the thermocouple connection from the heat block
  9. Carefully screw the new thermocouple into place
  10. Carefully thread the thermocouple wire back through the sheath. (It is probably best to cut the zip ties and replace them when finished).
  11. Put the red wire of the thermocouple wire into the "Red" terminal (A section) of the green block and the yellow wire into the "Yellow" terminal (A section)
  12. Tighten the screw and make sure the wires are secure
  13. Replace the extruder head, turn the machine on and test.

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