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Support > Frequently Asked Questions > What do the LEDs on the back of the displays represent?

What do the LEDs on the back of the displays represent?

Depending on the model, there are two or three LEDs on the controller board. One LED is a “controller good indicator” that comes on when the controller firmware has powered up and is running. This LED shows the unit has power. The second is a “controller busy indicator” that lights up during command processing or upgrades/downloads. Some boards have a third LED, which indicates activity on the USB port.