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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › I did a Bonehead thing, RX history???
10-29-2006 01:08 AM  12 years agoPost 1
bexusflexus

rrApprentice

Tulsa, OK

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Using a Futaba 149DP w/9CHP radio in Fury. Got a new Rx batt pack JR 2700mAh. Decided to use Triton charger w/Futaba leads and quick charge pack at 3amps. Hooked up the charger leads from the Triton through the charging lead on a JR switch (switch in off position) and heard a pop as soon as I started the charger. After this, no servo function. Power still goes through the Rx because the gyro light is coming on, but that is it. Tried a diff battery but the result is still the same.

The bonehead thing was to leave the Rx hooked up while attempting this and assuming the Triton reverse polarity protection would prevent this.

The original battery is still showing 5volts. I pulled the Rx used a diff battery and hooked up a servo into each channel of the Rx. I could hear the servo getting power but the servo would not respond to radio cmds.

Do you think the Rx is fried? If so, would the crystal still be ok?

even not doing anything would have been better than nothing...

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10-29-2006 01:17 AM  12 years agoPost 2
JuanRodriguez

rrProfessor

The Villages, Florida

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The "reverse polarity" thing applies only to the transmitter... so I'm not sure what your problem may be... unless I'm not understanding your post quite right ...

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10-29-2006 01:37 AM  12 years agoPost 3
bexusflexus

rrApprentice

Tulsa, OK

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I don't think reverse polarity only applies to the Tx. Anytime, you can reverse leads on any connection you have reverse polarity. This is the case when going from a Futaba charge lead to a JR battery pack when it is plugged in "backwards". That is, the connectors will plug together in either direction. If I were going from Futaba to Futaba connectors then this is not possible since there is a plastic tab forcing you to plug the connectors together only in the correct direction.

I believe what I did was plug the connectors together so that the pos(+) was plugged into the neg(-) side of the battery, resulting in the problem.

I knew there was the potential for this, but I was in a hurry to go and fly again. Also, I thought the switch would protect the receiver circuit from any potential damage since the switch was in the off position. I also thought that the Triton charger reverse polarity protection would kick in and give me a warning instead of firing off 3amps. However, it appears I was wrong on both accounts.

If I can clarify anything please let me know. If I am wrong about anything please let me know. Thanks.

even not doing anything would have been better than nothing...

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10-29-2006 01:42 AM  12 years agoPost 4
sandals4me2

rrNovice

Anthem, Arizona

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bexusflexus
You have a P.M.

Kevin

No these are not my sandals, Im just keeping them warm. 08/23/60-05/26/06 RIP Bro.

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10-29-2006 01:48 AM  12 years agoPost 5
JuanRodriguez

rrProfessor

The Villages, Florida

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Still not sure of what your problem may be....

If you plugged your Trion to a battery "reversed", the Triton should have given you the warning and not proceeded with the charge....

Your Triton does not know the difference between "JR" and "FUT" batteries, per se....The problem arrises when you try to charge your transmitter with "reversed polarity"..... you'll blow the fuse in the Tx. unless the polarity is correct...


I guess I'm missing something in the translation.....

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10-29-2006 01:50 AM  12 years agoPost 6
bexusflexus

rrApprentice

Tulsa, OK

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I know it is weird. I did hear the dreaded "pop" though. I am stumped.

even not doing anything would have been better than nothing...

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10-29-2006 01:55 AM  12 years agoPost 7
JuanRodriguez

rrProfessor

The Villages, Florida

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Just try a different switch or bypass the switch and see what happens....

I'm sure your Rx and battery are probably OK....

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10-29-2006 01:00 AM  12 years agoPost 8
JuanRodriguez

rrProfessor

The Villages, Florida

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PS--

In re-reading your original post, I would recommend that you NOT try to push 3 amps through any switch harness to charge the battery. I don't thing the switch can take it....

That's why I (and others in my flying group) have gone to having battery packs custom made with TWO leads. One lead goes to the switch and the second lead is used for "testing" the battery with a loaded meter AND for charging the battery.... That way, you are not charging through the switch...

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10-29-2006 01:37 AM  12 years agoPost 9
bexusflexus

rrApprentice

Tulsa, OK

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I did try a diff pack and by-passed the switch. Still didn't work. Sounds like the Rx got it huh.

That is an interesting idea about the 2nd lead to the pack. I might try that.

even not doing anything would have been better than nothing...

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10-29-2006 02:15 PM  12 years agoPost 10
BarracudaHockey

rrMaster

Jacksonville FL

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Once again, reverse polarity only applies to the transmitter where on JR the center pin is ground where on futaba center pin is hot.

If you plug in a reciever battery "backwards" all that will happen is the hot leads wil be connected but there will be no ground, all batteries are wired the same in any case. The only thing you could have done is reverse the bannana plugs at the charger end then the charger would have picked that up and shut off.

3amp charge? Holy schnikes.

Andy
AMA 77227
http://www.jaxrc.com

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10-30-2006 04:22 PM  12 years agoPost 11
bexusflexus

rrApprentice

Tulsa, OK

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Thanks to all who responded. I had a chance to take a look at this yesterday more closely. If the Futaba plug is reversed on a JR switch wiring harness what happens is the hot wires still mate up correctly but the ground on the Futaba side is connected to the signal wire (yellow) on the JR side. The yellow JR signal wire is not protected by the switch at all, didn't know this at the time. Looks like the receiver became the ground for 3amps. It may be that the crystal was the only thing damaged since the receiver still allows current to flow through it. I am going to test this as soon as I can get my hands on a crystal on my freq. Will report back.

even not doing anything would have been better than nothing...

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10-30-2006 04:30 PM  12 years agoPost 12
hpilotrc

rrVeteran

NY--->>Mooresville, NC USA 8/2005

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What happened.....pop noise.....
If you connected up the receiver via reverse polarity and heard a pop....chances are you fried part of the pcb lands. The crystal would not be damaged and be the least of your problems!

Michael

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10-30-2006 04:43 PM  12 years agoPost 13
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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The third (yellow in your case) wire on the switch harness is for dsc (direct servo control) which allows you to control your servos with the transmitter and not produce rf. I would say that your switch is wired to open the grnd (black wire) to shut off the power. When you plugged the plug in backwards, the hot wire connected to both the positive lead of the battery, and the positive terminal of the receiver. Now the grnd was connected only to the dsc input of the receiver. The triton probably detected voltage through the dsc circuitry of the receiver. When you hit start it tried to pump 3 amps through this circuitry. I would say yes, you fried your receiver

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11-02-2006 01:36 AM  12 years agoPost 14
bexusflexus

rrApprentice

Tulsa, OK

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Thanks for all of your comments. Very informative. I talked to Futaba and they suggested that I try a new crystal before a send in the unit. I should have one by the end of the week. Will report results.

even not doing anything would have been better than nothing...

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11-02-2006 09:42 AM  12 years agoPost 15
NZ_Neil

rrVeteran

Auckland, New Zealand

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I did a simmillar thing a few years ago but instead of attaching the Robbe Charger to the Charger lead I accidently pluged into the spare lead that sticks out of the GV1 (used for running a mixture servo and looks identical to a charging plug)

Yep it went pop too (thats the GV1, one servo and the 149) !

An expensive mistake.

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11-02-2006 04:59 PM  12 years agoPost 16
bexusflexus

rrApprentice

Tulsa, OK

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Yes, I hate that "pop" sound second only to the sound of my alarm clock going off in the morning.

Fortunately, all my servos are still working and the batt pack seems ok.

even not doing anything would have been better than nothing...

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11-03-2006 06:31 AM  12 years agoPost 17
bexusflexus

rrApprentice

Tulsa, OK

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Well I changed out the crystal today and no joy. The receiver is shot. Looks like I'm going to have to get a new rx. That was the most costly mistake I have ever made on the ground. Live and learn. Thanks for all of the thoughtful input.

even not doing anything would have been better than nothing...

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11-03-2006 03:10 PM  12 years agoPost 18
BarracudaHockey

rrMaster

Jacksonville FL

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All electronics work by allowing smoke to flow freely inside the case. Once you let the smoke out they dont work any more.

Andy
AMA 77227
http://www.jaxrc.com

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11-03-2006 04:27 PM  12 years agoPost 19
bexusflexus

rrApprentice

Tulsa, OK

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That's a good one. I should've never opened that case

even not doing anything would have been better than nothing...

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11-17-2006 05:38 AM  12 years agoPost 20
JWatson

rrKey Veteran

Mustang, OK

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I know this topic is a little old, But I did almost the same thing with a Triton. I was using the Fromeco switch and I charged the battery in the heli with the Pin out. (Power turned on) I also heard a faint noise , but the "Magic Smoke" was gone. It took out 4 DS811 servos but somehow the 401 and the 9254 survived.

I just sent the Servos in to Horizon and they replaced them under warranty.

Sounds like almost the same thing!

Good luck,

Jarrett W.

Jarrett Watson
http://jarrettrc.wordpress.com/

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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › I did a Bonehead thing, RX history???
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