Smoke in the cockpit! - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-12-2006, 12:44 PM   #11
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I haven't opened a Futaba receiver lately so take this with a grain of salt.

1. Check your wires for any sign of melting.

2. You may not have damaged anything important........ see why...

Did you plug the battery into the the battery slot?? When you did this, the power would have gone through the 3rd pin. This is not the same as reversing the polarity. Power may not have been passed to the the main IC or to the servos.

Take a look at the foil pattern on the bottom of the board to see where this pin goes. If it does not go directly to anything or goes directly through a resistor somewhere then I would investigate to see if it is of any importance.

Good luck.
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Old 04-12-2006, 12:54 PM   #12
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Thanks for the input... I'd like to have a look at the receiver... are they easy enough to open up? I'm not at home right now so it's not in front of me.... I've never had a need to look inside a receiver before. Is it just a two piece case held with screws?

thanks again...
Steve Hayes, MAAC 51896
4206'15"N 8305'40"W

Sun Parlor RC Flyers Tower Field
4210'13"N 8302'49"W

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Old 04-12-2006, 05:12 PM   #13
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Use a magnifying glass with a good light when looking. The copper traces and components get very small especially on the newer stuff.
John Davidson
Keep the shiny side up and the wheels down
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Old 04-12-2006, 05:29 PM   #14
Claude Paradis
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All good advice. The battery short thing sounds like the most likely.

When you are checking servo functions, make sure you put a good physical resistance load on the servos. Either by your hand on the servo output arm or the control surface itself. My reasoning is if a circuit was weakened by the short, the servo functions may pass the wiggly test when "empty" - but would complete the circuit failure when loaded. If everything passes under load you are probably good to go.

If after all the checks, you decide to be replacing. Know that I have both excess new receivers (Hitec Supreme) and brand new 4.8v rx batteries. Which I would sell to you at a reasonable price.

I have a few of these as well as a bin full of new or as new servos (Hitec and Futaba). I will be posting the complete list and quantities for sale in the next week or so; when I get a chance to sort out exactly what I need and exactly what can go.
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Old 04-12-2006, 05:56 PM   #15
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I agree with tech1.. You really didn't connect the battery backwards, but you did apply a + to the board and pulled the signal line to a hard -. But if you were in the battery slot this pin may not be used....I dont see how you would affect any servos. What module of receiver were you using.

Sound to me like you didn't let enough of the magic smoke out for it to stop working or the smoke came from the wires.

Would I do my maidan on this receiver.. NOT A chance but I would try it in a smaller , lighter plane after I spent some time looking over the receiver, following the traces from the pins that were used incorrectly. Possibly drawing a schematic. Followed by some long range test.
All Electronic components contain SMOKE. Once you let the smoke out, they stop working
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Old 04-13-2006, 06:57 AM   #16
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Lots of good advice... thanks... I won't get a chance to look inside the receiver until the weekend, but at least I've got a little better feeling about what I'd be looking for. I still plan on doing the maiden flight with a different receiver, but I'm feeling a little more confident that this one may be ok. The battery wires look a little blistered so I'm pretty sure the smoke we saw wasn't the magic kind from inside the receiver.... I think it was just the battery wires getting too hot. Thanks for the offer on the receiver and battery Claude, I may just take you up on that. Send me a PM with a price.

Steve Hayes, MAAC 51896
4206'15"N 8305'40"W

Sun Parlor RC Flyers Tower Field
4210'13"N 8302'49"W

Ontario Adhesives
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Old 04-13-2006, 07:13 AM   #17
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A visual inspection is not enough to determine if the receiver is damaged. When some electronic components are subject to enough reverse polarity, they change their characteristics, especially if the resulting heat was great enough. What's worse, the small traces (connections on the circuit board) on the new surface mount technology (smt), and especially newer multi-layer boards are more fragile than you might think. What's worse, with multi-layer boards, you can easily damage a trace with no visible evidence.

When in doubt, I ship my equipment in for servicing with a typed note clearly indicating what I did, and what my concerns are. I did something similar to a reciever a couple years ago, it appeared to be working correctly but I sent it in anyway. It was found to be intermittent and Horizon replaced it free of charge, even though I had clearly indicated it was my own fault. Excellent service!

I doubt your servos, or even the crystal are damaged, they would not be in the circuit path for this type short.
MAAC# 12719
Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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