Need reciever help bad - RC Groups
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Nov 02, 2001, 11:52 PM
Registered User

Need reciever help bad

My new reciever just came in, a FMA direct extreme 5. Seems to be a very fine piece of work. It is setup for futaba gear. However, I have a newly purchased speed controller, a GFS micro speed controller from Sirius, that uses a JR plug for the reciever. Being naive as i was, i plugged the JR plug, assuming it had been futaba since everything else i ordered was. I'm not sure it was this, or something else, but my seems not to be working. It was working somewhat, then it just stopped. I believe something is leaking out of the top of the reciever too. So i question rather or not it was this error of placing the wrong plug in, or something else? Also, is there a way where i can convert my JR plug to a futaba or hitec setup? I'm really anxious to get all of this building crap over with so i can start flying. Please help me.
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Nov 03, 2001, 02:22 AM
Electric baptism 1975
DavidN's Avatar
Can't tell you what happened; but jr & futaba plug wiring are the same and isn't the problem.
Nov 03, 2001, 04:43 AM
Registered User
max z's Avatar
captainjulio, you could have reversed polarity, which would be bad for the receiver since the BEC system in the speed controller feeds it. Futaba plugs have a little locator to prevent this, but the JR plugs can be plugged in reversed. When used on a JR receiver, this is prevented by the chamfered corners on one side of the plug. Compare the colors of the wires, the brown wire on thr JR should be on the same side as the black wire on the Futaba.

Nov 03, 2001, 05:38 AM
RIP Azarr - "Old age is not for sissies"
Azarr's Avatar

David N is right, you can't hurt the receiver by plugging the speed control in "backwards" it will either work or not since the center wire is positive. Make sure the color code follows that of your servos and it will work in your receiver. If you let the smoke out of your receiver, something else is probably wrong. You do have the ESC plugged into your throttle channel and not the "battery" port don't you?

Nov 03, 2001, 10:22 AM
Registered User
Futaba transmitters always need the throttle channel reversing for use with speed controllers. Some speed controls won't start up if you switch everything on with the Tx stick at full throttle. Also, make sure any ATV and trim adjustment on throttle are set as wide as possible. Once it works, you can trim these back to suit your needs.
Nov 03, 2001, 10:39 AM
Ascended Master
Sparky Paul's Avatar
I've run into the throttle reverse situation with Wattage ESCs.. not something you expect, but change the polarity on the throttle and see what happens.
Nov 03, 2001, 12:07 PM
Registered User
max z's Avatar
OK, may be reversing the JR plug does not hurt the receiver, but Captainjulio sez " nothing works", I read that as neither ESC nor servo's. Reversed throttle or not, plugged into the battery port or not, the receiver and the servos should work OK!( if you plug the ESC in the right way around).
Just trying to separate one issue from the other,

Nov 03, 2001, 02:21 PM
Registered User
Rotten Robbie's Avatar
Try checking the Rx on a standard Rx battery instead of the ESC. Ie, leave the ESC disconnected, but connect the other servos.

If that works, then the Rx is not damaged. If this does not work, YOU HAVE A PROBLEM.

I have a GWS JR ESC for a Futaba system. I was WARNED NOT TO PLUG IT IN BACKWARDS. But the way the connectors are wired, I really don't see a problem. BUT THERE MAY BE ONE. I DON"T PLAN TO INTENTIONALLY TRY IT JUST TO FIND OUT.


Retired Sr EE