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Step Type:

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Unplug the thermistor (plug with 2 white wires) and the heat sink fan (white plug with red and black wires. As shown with the RED arrows in Pic 1.

Unscrew the heater cartridge terminals as shown in Pic 1 with the GREEN arrows. You should now be able to lift away the hotend and set it aside.

The SE300 board should now be by itself for you to work on it as shown in Pic 2.

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