Use the 2.5 mm hex wrench to remove the bolts securing the cover. Set the cover and
bolts aside.
12. Identify and label the new left thermocouple.
Take out the new bar mount and unwind and separate the thermocouples. Orient the
bar mount so that the two sets of white heater wires emerge from the back of the bar
mount and the nozzle point downwards. Add a tape label to the very end of the left
thermocouple to identify it.
13. Replace the thermocouples in the extruder cable with the ones from the new bar
mount.
Lay the thermocouples out next to the bundle of extruder wires with the new bar
mount next to the old one and the two sets of red and yellow leads at the Mightyboard
end.
The bundle of extruder wires is taped together at intervals. At each point where the
bundle is taped, clip the tape, remove the old thermocouples, add the new ones and
re-tape the bundle.
14. Remove the old thermocouple leads from the Mightyboard.
The two old thermocouples should be connected to some terminals at the corner of
the Mightyboard closest to the Z-axis motor. If these terminals are secured by buttons,
push the buttons on the terminals to release the red and yellow leads. If the terminals
are secured by screws, use a small flathead screwdriver to loosen the screws until you
can remove the leads.
15. Add the new thermocouple leads to the Mightyboard
Two of the terminals are labeled "A" and two are labeled "B". The leads for the left
extruder thermocouple go to the "B" terminals and the leads for the right extruder
thermocouple go to the "A" terminals. Each set has on terminal labeled "Red" and one
terminal labeled "Yellow." It's very important that each lead go into the correct
terminal.
For terminals with buttons, press the buttons on the terminals, slide the leads all the
way in, and release the buttons. For terminals with screws, slide the leads in and
tighten the screws. Tug on the leads to make sure they're secure. You might find that
it's easier to reconnect one lead at a time.
16. Return the electronics cover to the bottom of the MakerBot Replicator 2X.
Use the four small bolts and the 2.5 mm hex wrench to secure the cover to the bottom
of your bot and flip the printer upright again.
The old bar mount should now be completely disconnected from the Mightyboard, the
extruder cable and the extruders. You can discard it.
