These indicators show the status of 3.3v power, 5v power, the Vin (power from your power supply) and the two extruder heaters.
When the board is idle and connected to a power supply, expect the 3.3v, 5v, and Vin LEDs to be illuminated.
When the board is powered only through an external 5v supply or through USB, expect only the 5v and 3.3v lights to be on.
In this area you will also find indicators to show when an extruder heater is turned on.
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