Did I fry my receiver? - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-27-2005, 04:11 PM   #11
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Thanks for the info on the terminals just_lkn. It looks like I'll have to track down a new cap. Radio Shack doesn't list one the right size, but I'll check some electronics repair shops in town and see if I can dig one up. I also saw a posting that said if you just remove the capacitor it would still work, but you lose the safety provided by the cap.
Also just wondering... when I plugged it in briefly the second time, the cap. got red hot immediately. Is this normal for a blown capacitor? The battery *was* plugged in correctly this time.

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Old 03-27-2005, 04:42 PM   #12
Gary Maker
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I believe the answer to your question is YES! It has already melted down and is now directly shorting the circuit! At least that is what I would guess!

I am sending you a PM with some info for you!
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Old 04-04-2005, 10:23 PM   #13
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Originally Posted by monty_11

The rx is for futaba (channel 4 radios. I was going to use my Futaba 6XAS tx with it. The battery pack was from a bunch of equipment I got from another RCC member and it has an Airtronics connector on it.

I suppose in retrospect I should have waited to hook the ESC up and might have avoided this problem, but hindsight always arrives just a few minutes too late!

I just pulled the cover off the rx and I think it's toast. There is a chip next to channel 6/B that is cracked and bubbled up on the surface. I guess it wouldn't be worth trying to see if it could be serviced?

Airtronics use different wiring than Hitec/Futaba!! That is your problem, you need to install a futaba connector or change the pins to mach a futaba connector. Im shure another member on here will have more details.. I used to fly airtronics but now only have futaba and all my old servos and batt packs had to be rewired to work with my futaba stuff.

Awww crap my rudder fell off.
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Old 04-13-2005, 11:12 PM   #14
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Back from the dead

Well after a bit of tense soldering activity last night I'm happy to say I've brought back this RX from the dead. A kind soul in Texas mailed me a new smoke-filled Tantalum capacitor which I was able to solder in place of the one I blew up. It was a tad longer than the original one, but there was enough overlap in the solder contacts to make it work okay.
I have to say, after screwing up the first time I was a bit apprehensive to plug the battery in again, but after offering up a sacrifice to the god of stupid mistakes I plugged everything in again. The one servo I had plugged in gave a little twitch and scared the c#$p out of me . Not seeing the expected cloud of black erupting from the rx, I thought I'd go for broke and turn on the tx. Lo and behold everything worked like a charm.
Don't know that I'll trust the rx in anything expensive but it's nice to know that I don't have to scrap it either.

Thanks for everyone's input and suggestions.

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Old 04-14-2005, 07:29 AM   #15
Dave Holmes
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In this scenario, what happened was the capacitor shorted out and basically took the heat (literally) for the rest of the circuit. It shunted virtually all the curent away from the rest of the receiver. On the other hand, had it blown apart on ignition (I've seen them do that, too!) it would have been open circuit and the Rx would have had to deal with the full brunt of the reversed voltage.

It sacrificed itself for the greater good!
Dave Holmes

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