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EXT_5V is an optional 5v power input and is not required for operation.

The Duet has an on-board 5v regulator that gets its source from the 12-24v input.

If you wish to provide external 5v power, or control an external ATX power supply, you may read more about it in the wiki.

Unless you plan to provide an external 5v source, you should at this time check that there is a jumper on "INT 5V EN" and NOT on "EXT 5V EN".

INT 5V EN

EXT 5V EN

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