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# Electrical fuses
## Determining if a fuse is blown
It is easily determined if a fuse is blown by using a multimeter to measure if the fuse is still conducting. If you are certain that a fuse is blown, you will have to replace it by a similar fuse that can handle 500 mA.
{% hint style="success" %}
The fuses have **changed on recent boards** to an **automatically resetting type**. You should **never have to change them**. If they do open, simply **wait** a very brief amount of time for them to reset. However you should determine \*WHY\* the fuse opened before attempting to use the board.
{% endhint %}
## Fuse locations
RDDRONE-FMUK66 has three fuses, two (F1 & F2) for the CAN transceivers, and one (F3) for the USB port.
## Fuses F1 & F2 (CAN transceiver)
## Fuse F3 (USB port)
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