Way back in FrSky history, some items could be killed if plugged in backwards. They almost always have reverse polarity these days. But speaking from first hand knowledge, if you do manage to reverse the voltage into a servo you will kill it. This is usually the result of adding wing connectors and not paying attention.
Pretty sure FrSky has marked all of their receivers, and the LEDs do a different light show when reversed.
Years ago they mis marked a full production run of one of the receivers. They used to use stickers back then. Now they typically are molded into the case. A little silver paint pin could be used to highlight the polarity markings.
Pretty sure FrSky has marked all of their receivers, and the LEDs do a different light show when reversed.
Years ago they mis marked a full production run of one of the receivers. They used to use stickers back then. Now they typically are molded into the case. A little silver paint pin could be used to highlight the polarity markings.