reverse polarity?
09-26-2005, 10:17 PM
#1
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reverse polarity?
I just did a really bad thing. I plugged a fully charged 5 cell receiver pack with a hitec connector into a futaba receiver backward. It was only in for a fraction of a second before I removed it. I have tested everything over and over and it works fine. The battery is showing normal voltage and the receiver works flawlessly.
What problems would this cause? Does a futaba receiver have polarity protection? The connector on the battery got a little warm, but everything works fine now. I really hope I didn't fry anything!!!! Anyone have advice?
Why can't hitec make a non reversable plug?!?
What problems would this cause? Does a futaba receiver have polarity protection? The connector on the battery got a little warm, but everything works fine now. I really hope I didn't fry anything!!!! Anyone have advice?
Why can't hitec make a non reversable plug?!?
09-27-2005, 08:41 AM
#4
RE: reverse polarity?
ORIGINAL: Ultra Stick
Why can't hitec make a non reversable plug?!?
Why can't hitec make a non reversable plug?!?
Be very careful what you wish for as whomever is on top in sales in any quarter may actually wish to to return to brand incompatability. Its taken far to many years to acheve at least plug compatibility with three majors. Hitec (S), JR and Airtronics (Z) with Futaba also being compatable by cutting of that silly tab.
In my opinion the days of any of the manufacturers attempt to control their customers spending by the use of proprietary plugs or refusal to provide modulation shift select are over. Information is so much more readily avaliable.
John
09-27-2005, 09:13 AM
#5
Senior Member
RE: reverse polarity?
Unfortunately, on the Futaba 127 reciever, if you plug the battery connector into the battery slot reversed, you put a dead short accross the battery leads as the third connection (what is normally the signal lead) is jumpered directly to the plus--center terminal--of the receiver printed circuit board. I've seen this mistake burn up the switch harness on three different planes. Had you plugged the battery into any other slot, no harm would have been done. Usually, when this mistake is made, the receiver is seldom damaged as the switch wireing burns out before the circuit board copper strip does. Yes, IMHO, this was a dumb design error on Futaba's part.
09-27-2005, 09:17 AM
#6
My Feedback: (31)
RE: reverse polarity?
ORIGINAL: Ultra Stick
I was plugging a regular hitec rx battery directly to a futaba 127 receiver to setup the radio.
I was plugging a regular hitec rx battery directly to a futaba 127 receiver to setup the radio.
FWIW: The Hitec plug is polarized, same as JR and new Airtronics. You simply plugged it into a Futaba RX which is not designed/shaped to prevent reverse installations of this type plug.
09-27-2005, 09:53 AM
#7
My Feedback: (31)
RE: reverse polarity?
ORIGINAL: Rodney
Unfortunately, on the Futaba 127 reciever, if you plug the battery connector into the battery slot reversed, you put a dead short accross the battery leads as the third connection (what is normally the signal lead) is jumpered directly to the plus--center terminal--of the receiver printed circuit board. I've seen this mistake burn up the switch harness on three different planes. Had you plugged the battery into any other slot, no harm would have been done. Usually, when this mistake is made, the receiver is seldom damaged as the switch wireing burns out before the circuit board copper strip does. Yes, IMHO, this was a dumb design error on Futaba's part.
Unfortunately, on the Futaba 127 reciever, if you plug the battery connector into the battery slot reversed, you put a dead short accross the battery leads as the third connection (what is normally the signal lead) is jumpered directly to the plus--center terminal--of the receiver printed circuit board. I've seen this mistake burn up the switch harness on three different planes. Had you plugged the battery into any other slot, no harm would have been done. Usually, when this mistake is made, the receiver is seldom damaged as the switch wireing burns out before the circuit board copper strip does. Yes, IMHO, this was a dumb design error on Futaba's part.
This is interesting.... Is this specific to the 127 only?
09-27-2005, 03:40 PM
#9
Senior Member
RE: reverse polarity?
mglavin, yes, as far as I have seen, the Futaba 127 is the only one that does this although I have not opened up and checked many others. It is easy to verify for yourself, just remove the receiver from its case and look at the wiring on the pc board.
