Hi,
I went out to my flying field yesterday with my Hangar 9 Extra Easy trainer. I was sure that I was ready to fly and everything was set up properly and the batteries were fully charged. I turned on my JR421 72mhz ch36 radio and then the plane's JR R600 receiver. When I checked the controls, the throtle, elevator and rudder worked fine. When I tried the ailerons I moved the stick to the right and the right aileron moved up, when I moved to neutral both ailerons began to cycle up and down on their own for about 4-5 seconds! I turned everthing off and then back on and the ailerons were showing eratic movements on their own. The single servo controling the ailerons is a JR 537. I am not sure of what the cause of this problem is. After I returned home I changed the servo and cannot duplicate the problem. I wonder if I have a receiver or radio problem. My flying field is very close to a medical building and I wonder if it was caused by interference.

Sometimes the contacts in the servo plugs will get a little bit of corrosion on them. I've had good luck just plugging and unplugging them fully several times to clean it off.

Can't hurt to try.....

Were you flying with a 6.0 v Rx battery? When I fly with mine freshly charged, it does that. Also, you may want to get a few feet from the plane and see if it settles down. I think that if you are very close (couple of feet), the Receiver can become saturated and respond erraticly. Hopefully this helps.
Curtis

Most probably what Just Erick said, dirty or corroded contact(s) or (if using Y connector) a bad solder joint in the Y.

Thanks Curtis,
I am using a 4.8v battery but I used a Hobbico triple deep cycle charger on it for the first time and it was reading 5.4volts. I was also within two feet with the antenae extended. I will try your suggestion.
Richard

If you were this close to the plane then this is quite likely your problem. When a transmitter is this close to the receiver it can actually overpower the receiver and cause problems exactly like you are experiencing. Do a proper range check on the plane and see if the problem persists.

Ken

I have had and seen servos go nuts with everything mentioned, mostly it's my JR servos jitter with a hot charge. Analog, not digitals. I have also had my servos act funny when I was too close to a chain link fence. Just something else to think about.

I agree, too close. May not fix problem but not helping either.

Ret. Electronic Tech. for over 25 years one of the BEST things we used to clean Pot's/ Switches/jacks/plugs/Etc. is WD-40

Why not electriclean contact cleaner? I have always shied away from using wd-40 for electrical parts. From my experiences it absorbs moisture after awhile.

None of the proffessional cleaners work as well or as long I've had many recalles using them, working on military Eqp. I
had access to every cleaner, nothing lasted as long as WD-40, safe for all electronic components and drives out moisture. Also many spray cleaners
use a lot of pressure and dischard very cold this can damage electronics, the cold can also permanently change the oscillating frequency of crystals. (I don't know if WD-40 will damage wood) recommend remove electronics before use.

WD-40

The WD stands for Water Displacer.

Jack

I undertsand what wd 40 is supposed to do but from my experiences with it it does not live up to those standards. Spray down a bare metal autobody part with wd-40 and set it outside for a day or two. Just the moisture from the morning dew causes surface rust. When rodding my 30 model a sedan that was the problem I ran into. So I started using an oil soaked rag. I know it is not the same as an electrical part but still the moisture was not displaced. That is an extreme test. I have had body parts flashrusted inside the shop when I walked in the next day to continue work, just from the moisture in the air. Sorry to get off of the subject.

I had something similar to this happen with a JR quattro system that i used. Only difference was all servos would do it. I changed recievers (used a friends reciever and radio) and i never had a problem. The LHS tested a new reciever, and the problem never happened again, till about 6 flights later, and I lost my plane. If i were you, i would get the reciever tested, and not use the servo again. Its not worth losing an entire plane.