X8R Servo movement upon power up.

[nioa]

Hi, when I power up the receiver, all channels go to one extreme for a moment, and then "0" out. I would expect that there would be no servo movement at all. This is highly undesirable. Think electric retract channel among other things, getting this conflicting command.

I have swapped out two other X8R's and they all have the power-on servo movement. Brand of servo doesn't seem to matter either, Hitec, JR, and Futaba, all do it, so I'm thinking that it is a receiver thing.

I'm binding with a QX7S, and I have even tried different failsafe modes, just to see if FS makes any difference, it does not.

Is this a receiver firmware issue? The X8R is recently purchased from Aloft, so I would think that the firmware is up to date. Can this action be turned off, or is this just the way it is?

Am I just missing a setting in the QX7S?

Thanks

 

[Wayne]

This is not normal. There may be a small blip at power up, but that is it. I do recall someone having this issue a couple of years ago, but I can not recall what the issue was. Anyone else have an idea?

For some of the retract actuators, If they use relative positioning they may need to "home" when powered up.

 

[nioa]

I'm not doing anything esoteric. All the PWM output channels do it. I haven't tested the s.bus, so I don't know about that yet.

I simply connected 8 known good servos to each of the PWM output channels. I even created a new model in the QX7S that only had the first 4 channels active, and all of the channels still move on power up, so I don't think it's a radio thing.

Thank you for confirming that it is not normal behavior, I thought it was strange. I have video of the "sway", lets call it, but no where to post it to show you. The movement occurs in the time you would count to one-one thousand, two-one thousand.

Any help would be very much appreciated.

Nick

 

[Wayne]

Yeah, I have seen it.. I don't recall the issue. For a quick test, if you only have a single servo plugged in, does it still do this? How about just a digital servo? I think I know someone that might know the answer.

 

[nioa]

Single analog, yes it moves. Digital, one or many, does not. I think you're on to something here.

 

[Wayne]

Ahh, OK. I was thinking that the X8R might have a 9MS frame rate mode, but looking at the instructions I don't see mention of this. Anyone know if that is the case.. I seem to recall you push and hold the F/S button for a while to set the 9m/s mode...?? I'm not at all sure on this. Might be worth a try.

 

[nioa]

A quick press of the f/s button or a 6 second press, while powering on in bind mode, didn't change any mode, unless I did it wrong.

I rebound the receiver (with a real short bind press) and the Hitec analogs, worked correctly, now the JR analogs are the ones misbehaving. The Hitec digitals are perfect.
Maybe I should just stick to Hitec digitals

 

[Wayne]

I wish I could pull up what the issue was, but my brain is failing me. I have asked Kilrah if he recalls, hope to hear back from him as I think he had identified the issue way back when...