barryt Posted September 21, 2022 Share Posted September 21, 2022 Taranis X9D+ Tx with X8R Rx. All 8 channels used. Standard size analog servos. During pre flight checks I noticed one of my flaps was not working. The Tx monitor showed movement with the flap switch. All of the other channels were working properly. Back home the flap servo tested perfectly with a servo tester, so I swapped out the Rx and all was well. Any ideas what has happened here? Would it be worth reloading the Rx firmware or would it be an electronic component failure? Quote Link to comment Share on other sites More sharing options...
Philip Lewis 3 Posted September 21, 2022 Share Posted September 21, 2022 Quite likely to be a mechanical joint failure on that channels signal pin, highly unlikely to be software related, especially as it did work and nothing got changed. 2 Quote Link to comment Share on other sites More sharing options...
PatMc Posted September 21, 2022 Share Posted September 21, 2022 Assuming it's channel 8 that's dead & that you're using the BEC of an ESC, try plugging the ESC into the duff channel (Remove the prop from the motor 1st). If the other channels are dead then it'll be +ve or -ve open cct, which may just be a dry joint on the PC board to socket pin. If channel 8 remains dead but the others work it could still be a dry joint but on the signal pin OTOH could be dry joint between signal pin & chip or a duff chip. I've never opened up an XR8 so don't know how easy the latter possibility would be to re-solder. Quote Link to comment Share on other sites More sharing options...
Peter Christy Posted September 22, 2022 Share Posted September 22, 2022 Before you get too carried away, it might be worth checking that it really is the receiver at fault and not a transmitter mis-configuration. Have you got another receiver you can temporarily bind to the same model memory to check? Something similar happened to me a while ago when I had been messing around with settings, and accidentally changed something I didn't intend to! -- Pete Quote Link to comment Share on other sites More sharing options...
Tim Kearsley Posted September 22, 2022 Share Posted September 22, 2022 That was my thought as well Pete, but the OP said he swapped out the Rx and it all worked. Quote Link to comment Share on other sites More sharing options...
Peter Christy Posted September 22, 2022 Share Posted September 22, 2022 Ah! Missed that! In that case it does sound more likely to be a mechanical failure of some kind. Electronic failures in things that have been working ok for a while are relatively rare. -- Pete Quote Link to comment Share on other sites More sharing options...
barryt Posted September 26, 2022 Author Share Posted September 26, 2022 Thanks for the feedback. I opened the Rx and had a look with a magnifying glass. It looks like there are resistor / capacitor networks in between the microprocessor and each signal pin but the components are so small I cannot get my multimeter leads on anything let alone affect any kind of repair. I'll install this Rx into a cheap foamy (which only needs 4 or 5 channels) and see if it deteriorates further. Quote Link to comment Share on other sites More sharing options...
John Wagg Posted September 26, 2022 Share Posted September 26, 2022 Did you check for voltage on the + & - pins of the channel output ? There should also be some voltage out of the signal pin but I have no idea what it should be as it will be a square wave output. Should be the same as all the other channel output signal pins. Quote Link to comment Share on other sites More sharing options...
barryt Posted September 27, 2022 Author Share Posted September 27, 2022 Yes John, I have power and ground on channel 6, but evidently no signal. 1 Quote Link to comment Share on other sites More sharing options...
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