700N DFC and AR7200BX help needed please

[chris427]

I bought a 700dfc last week and installed, well tried to install a AR7200BX fbl unit to it.
I'm having some serious issues that with my limited knowledge of setting it up, i really can't find a way to fix the issue no matter how many times i read the set up or check the servo connections i just can't see the wood for the trees so please, can someone put me out of my misery!!
I have plugged the servo's in to the unit, set the tx to 1 servo swash type and bx to 120 solid red light. What happens now is that it seems pitch is on the right stick and forward,back and cyclic is on the left! No idea what i've done or how to fix the issue.
As far as i can see the servos are in the correct ports on the 7200 but could someone please ease the pain and clarify which servo plugs in to which port so i can at least check that i've got them in the right ports before i go any further and can anyone clarify that by selecting 1 servo on the tx and then 120 on the bx unit that is correct as i've been trying to fix this now for 2 days and i still can't see where i've gone wrong and i can't move on to try and set the swash level etc until i resolve this. At the moment i keep trying not to look at the big hammer in the corner!

[Magic919]

Do you mean the TX is working like mode 1 instead of mode 2? Doesn’t sound like a problem with the 7200BX if so.

[chris427]

Yes, but it's in mode 2, works fine with my other 3 so not the tx setting for mode 1 or 2. I have however just found the same issue reported on Helifreak in 2013 and the problem seems to be that the servos are not in sync with bx so i need to reverse some to sort it out, well that sounds like fun!
https://www.helifreak.com/showthread.php?t=544926

[Magic919]

On my Trex channel 1 is the rear servo, channel 2 left and channel 3 right if that helps.

I find using the software with the USB cable easier, as you can step through and read a bit about each step.

I’m not sure I can see how just changing servo directions will cure yours, but hope it works out.

[Magic919]

That my BX settings and looks like those are Ele, Ail, Aux1 on the 7200BX.

[chris427]

Finally fixed it! Switched pitch and aileron and that got it all working in the right way then reveres elevator and aileron and it is now all doing as it should so thanks to Nicolas who i bought it from fixing it in about 15 seconds!! Now on to the full set up.

[Magic919]

Glad to hear it. Worth looking at YouTube videos for full set-up. On the BeastX some settings are specific to firmware versions. Not sure if 7200 is similar.

[chris427]

I've got the full set up book and video so will do step by step. Next problem I've found is that i can't log on to StudioX to update the unit with the latest firmware.

[Magic919]

Have you logged in there previously ? You should be able to reset the password if so.

[chris427]

Yes all done, had to update studiox before it'd let me in so 7200 is now updated and i'm stuck at point G on set up. Need more coffee!!

[chris427]

Still needing some help really. Done point G so it's all level but when i come out of it the elevator servo doesn't stay where it was set. Anyhow i have completed the set up and as i spool it up in the garden which is tight!! The tail lets go as it gets light on the skids and it wants to pitch right and back so something not right, The swash i can level again but the tail has me stumped, any ideas welcome.

[Magic919]

I’m just a beginner and got my BeastX working with some Google searches and the wiki https://wiki.beastx.com/index.php/Help:FAQ_Spektrum/en

Your point G query is in the FAQ I linked to.

I ran through set-up three times in the end as I cannot fly and wanted to hover my 500XT in my small garden. I spent time with the motor off, making sure the servos did nothing surprising. I moved the heli by hand to ensure all the reactions make sense.

I worked on the basis that first hover needed to be a take off with solely throttle/pitch inputs until it was off the deck. Because your sticks don’t control the servos, just make a request to the BeastX, it’s easy to make a tiny stick movement and see great servo deflection when the heli is on the ground. Once it is airborne there’s no such problem.

I found flicking mine from HH to rate mode and back would sometimes calm down the tail. I would disconnect the battery and start again if not happy. Powering up and letting it stay still until settled was crucial.

You may already know all this.

The only additional factor could be vibration. Testing with and without the engine running would be worthwhile. So many sensors in the BeastX that vibration or location make quite a difference to behaviour.