Steady tone from the TH9x transmitter?

Archive
1

On my 2-week old Iris+, my transmitter just started emitting a constant high-pitch tone when the battery is plugged into the Iris+. I actually think the tone (alarm?) is coming from the frSky DJT module on the transmitter.

I’ve installed new batteries in the transmitter and a fully charged battery in the Iris+. Even with the alarm sounding, the Iris+ will arm and thrust works (tested with no props). The RX and TX are binding.

What is this steady alarm and what should I do? I’ve researched in many places, but no answers so far. No replies (yet) from 3DR support or from the frSky support forum.

Thanks for any advice.

2

Are both white switches in the down position on the RF module? The should both be in the down position.

3

Yes. Everything was fine on the previous flight. The only thing that changed was I used a different PC for Mission Planner. Thanks for the help!