Tricpoter with KK2 board, servo not moving, please help!

[speedbird]

I have just been in the process of making the rc explorer v2.5 tricopter and everything seemed to be working when i first tested it, except the servo, it centers, locks up, and does not respond to any input at all. I have checked that it works by plugging it directly into the receiver and it works fine. The servo is a analogue fake Futaba standard size servo so it is cheap but does work, and the kk 2 board is set to the tricopter so I have no idea whats causing this. This is my first multirotor so I don't really no what i'm doing, just following instructions, so it would be really helpful if someone could tell me whats wrong with it / me.

 

[xuzme720]

The servo is powered by the ESC on any port from 2-8 on the KK2. If you have no BEC on those ESC's (motor 2 or 3) your servo will have no power. Also make sure the servo lead isn't plugged in backwards. darkest wire, black or brown will always go to the outside pins.

 

[Johan]

The servo is powered by the ESC on any port from 2-8 on the KK2. If you have no BEC on those ESC's (motor 2 or 3) your servo will have no power.

But then it would not center either

 

[xuzme720]

Oh wait, have you tried some throttle and then giving yaw(rudder) input? The servo usually won't respond unless the board sees some throttle. Try it with props off to be sure response/movement is in the correct direction before trying to fly.