Tricopter Tail Servo Not Working

[RadioMann]

I am completely new to RC, and have been working on a tricopter for quite some time now, and have been having all sorts of problems. I have devoted this thread to just one, involving my servo. It is a Vilros SG90 micro servo. I can't seem to get it to move. I am using a Hobbyking KK2.1.5 FC and a Turnigy Multistar 3s 10c Battery. I have not updated the firmware on the KK2.1.5. I plugged it in once with the servo directly connected to the M4 lead. Could that have fried it? Thanks.

-RadioMann

 

[Fyathyrio]

Get a servo tester, they are available all over ebay, your local hobby shop, or even here in the Flite Test store. The servo tester requires a 5v DC input, and then you attach the servo, turn the knob, and see if it moves correctly. Without that, anything else here is a WAG.

 

[1387]

If you don't want to get a servo tester, you can also power your (already bound to the TX) reciever, plug the servo in the trottle port and move the throttle stick of your transmitter. If the servo moves accordingly to the movement of the throttle stick, the servo is fine.

A servo tester is just a more convenient method that cancels out other errors like errors in the communication between transmitter and reciever and so on, so it could be a wise idea to get one.

 

[Craftydan]

One thing to be aware of on the kk2.x boards -- The servo cannot receive power from the M1 port. The M2-8 power pins are connected together but disconnected from M1.

If:

- you only have one ESC plugged in, @ M1
- the ESCs plugged into M2&3 are "Opto" ESCs
- the ESC connectors on M2&3 have the middle-red wire removed

Then the servo has no power source. in the first case, plug in a second ESC with a UBEC, In the second, you'll need an external BEC (can be plugged into any free motor channel, just make sure power goes to the middle pin) In the third case, put one of the red wires back in and you're good to go.

Otherwise . . . I'm with 1387 -- use your RX to test for function. A DOA servo is entirely possible.

 

[RadioMann]

No, it doesn't work with the servo plugged into the throttle port on my receiver. I am using a hobbyking t6a-v2. I have all my escs plugged in to m1-m3, and they all have built in becs. Is it fried?

 

[jaskoller]

RadioMann, please watch Davids Video on how to hook up the KK2.1.5 to your receiver. (I think you can find it on rcexplorer.se) and follow his instructions exactly. I had some issues with mine also until I watched/paused/repeated his video and set mine up exactly the same. Now it fly's like a dream. Hopefully you can get this resolved.

 

[makattack]

No, it doesn't work with the servo plugged into the throttle port on my receiver. I am using a hobbyking t6a-v2. I have all my escs plugged in to m1-m3, and they all have built in becs. Is it fried?

It sure sounds like a fried servo... but, did you check to see that it's plugged into the RX the correct way? Since the power signal is in the middle, it's very easy to plug the ground into signal and signal into ground... shouldn't cause any harm, but it won't work unless signal->signal is the connection between servo and RX. Also, I'm not sure why one would use just the throttle channel to test... I personally would pick either the aileron, rudder, or elevator channels because they tend to match the PWM values servos expect.