I have a R 127 DF Rx and plugged a JR 4.8 V. 600 M/A battery into it and the negative (brown) wire of the battery smoked. After plugging in a futaba battery (with the polarity tab) and checking out the functions the reciever is working fine on my work bench.

Im not sure what direction I had the battery plugged in but it has 3 wires, orange red and brown, the red wire (positive) is in the middle, negative wire smoked.

I have visually inspected inside the Rx and see no evidence of heat or discoloration and does not smell like it got hot. Since the Rx seems to be working fine, are chances good that I didnt hurt a thing?

Hi bipeflyr,

Since the receiver seems to be working for you, it might be okay, but since you did notice smoke, I would do a VERY thorough ground check before using this. I would really recommend that this be sent in so that the technicians can check this over for you.

The receiver is protected from reverse polarity causing heavy damage to the main board in just a case as yours. But again, I cannot stress enough that a thorough range check should be done each and every time before flight, if you are not going to send this to be checked.

I hope you find this information helpful. You can also reach our Futaba support technical team at 217-398-8970, or via fax at 217-398-7721.

Sincerely,
Krysta
Lead Futaba Customer Service and Programming Technician
Also you may want to check our Website at (http://www.futaba-rc.com)