Hi everyone,

I am stumped as I have been trying to help a new jet friend with failsafe programming with his JR 9303. He is using a 649S receiver, in the SPCM mode (if this makes a difference, both he and I are Futaba guys!)

Anyway, he begins by setting the throttle travel to +/- 150%, he then sets failsafe to low throttle, low trim. He then cycles TX power, resets the throttle travel to +/- 75% and cycles TX power again.

He then learns RC on the ECU.

Now, when he turns everything on, then turns off the TX, the throttle pulse width is not going to the original -150% value (and therefore of course no failsafe is detected by the ECU)

I get the feeling we are missing something obvious on the JR transmitter failsafe set up or travel adjustment. I tried to get a hold of Wilcox but he is probabaly out on some midnight Vegan hike or something!

Thanks in advance for any help anyone can give,

Regards,

Matt,

In the Fail Safe menu, move the cursor over the throttle channel and make sure it says something like -256 (why they don't display these things in % is one of those software to english mysteries). You don't have to do all those power off cycles. BTW, low trim has no effect at low throttle with travel set at 150%.

If that's ok, then the only other thing is how often the fail safe data is sent and how quick you turn the Tx off. I doubt you could get it off fast enough.

Go to the RC Check Menu and look at the pulses. My guess is you need to reverse the throttle channel to get the low pulse width on the idle side. I had something like this once and I found that Fail Safe was sending a full+ throttle pulse. Hurting my head remembering this problem, but I think that's what it was.

Rick

Thanks Rick,

Reversing the throttle was about the only thing we did not try, we will give it a go!

Thanks a lot.

Regards,

I cannot give much advice, but my 9303 works fine set up initially at plus and minus 100%, set failsafe at low trim and low throttle, then reduce to plus and minus 75%. Next, learn RC. I left the everything on during the setup.

Hey Guys,

I'm the guy having the problem - big thanks to mr_matt for all his help so far!

I tried the throttle channel reversing tip and unfortunately this didn't work either....

Any other ideas would be appreciated,
Thanks!

Hi Guys i am also having a similar problem,

I can get the failsafe to work on Futaba FF9 super, but according to the instructions it says after the .2secs of failsafe the engine will go back to last throttle position, as i use the middle rotary knob this means it will go back to full bore,

So even though i get the failsafe to work it will go to full bore after X AMOUNT OF seconds,

Matt J

In an effort to help you guys see exactly what I am doing, here are some pics:

First I set the travel limits on the throttle to 100% high and low:


Then I set the failsafe with the throttle stick and trim all the way down in the low position: (Edit: the pos# reads -256, this photo was when I tried to reverse the servo)


Then I set the travel adjustment back to 75% high and low on the throttle:


Then I re-learn the ECU. Once that is complete I wait a few seconds and then shut off the transmitter in the hopes that the failsafe symbol will appear on the GSU, this is what I get:


And this is what the failsafe count reads after switching the radio on and off a couple of times:


So any help you guys can offer would be greatly appreciated!
Thanks!

On my 9303 my current settings are as follows:

1. THRO: H100% L95%
2. Failsafe: THR set to F.S.
3. Pos. -256
4. Subtrim: 0
5. Rev.SW: THR Norm
6. Device Select, Trim Step: 40%

To get the Pos -256, set the travel adjust (TRVL ADJ.) for low throttle to like 150% with the throttle trim at neutral. With the throttle stick at low idle go to the Failsafe menu and set failsafe (F.S.), then press the memory button. When you get the large negative number, go back and readjust the throttle percentages hi and low. Next, try to do Learn R/C with the ECU and then check for failsafe by powering off the Tx. Good luck...

Ken

Thanks for the input! I tried to duplicate your settings but it still doesn't work. I did check the Trim Step and mine was set to 100%, but changing it to 40% didn't seem to help.

Now for the good news, I got it working! Here's how:

I set the travel adjust to its limit at 150% high and low.
I then set the failsafe.
Then I set the travel adjustment to 60% high and low.
Re-learned the ECU and voilla! The failsafe now operates correctly.

If I set the travel adjustment to anything higher than 60% and re-learn the ECU, the failsafe will not work. Would anyone care to offer up an explanation for this? Also, will the turbine run correctly with the travel limit set to 60%?

Thanks for all the input guys!