Problems!! 14MZ 2.4 R6014FS

[grayuk]

	Quote: Originally Posted by dbrford
	I just performed the heat test, using a heat gun (very carefully). Mine failed at 171F, this reading was taken at the side of the receiver right near the Easy Link text. I also noticed that this portion of the receiver is the spot that gets the warmest sitting idle, I read 85 F after sitting for 10 minutes. No load, no servos regulated 5.98 volts.

Would it be possible to repeat that test but with only 4 cells (4.8 volts)?
If the temp of failure increases then maybe Julez is on to something.

Paul

[DougV]

Hello guys:

I’m new to this forum but not to the hobby, I own both systems FASST and a DX7, I just finish testing/heating on the bench a FASST 607 and an AR7000 with a heat gun.

607 failed at 172F, and came back to life at 130F.
AR7000 failed at 205F.

This was done with a 4.8 volt batt.

Regards,
Doug.

[canavanbob]

It is finally sunny here 81deg F. I set my 35% Cap out in the sun this morning to soak. I went back later and turned on the plane and transmitter, perfect control as I moved the control surfaces. I played with it for ten minutes and all was well. The hatch/canopy has a foam and balsa floor (Carden). Receiver mounted with velcro, no foam. The planes surface was very warm but, when I removed the hatch, the receiver was warm but not hot. The plane has a lot of foam and I suspect that eliminates the green house effect.

[DougV]

At least now I can check my rx on a hot day and decide if I fly or not because more or less I know the range now.

Regardless on a very hot day I will be under one of those umbrellas drinking beer.

Doug.

[Julez]

Ok, did a quick test myself:

There are 2 failure modes:
- Regulator overtemp and
- chip overtemp.

In case of regulator overtemp, the LED will go out completely, because the voltage will have dropped below 2.56V. This is also about the lowerst voltage I have made the reciever work with:
http://www.rcgroups.com/forums/showt...88#post7443588

Chip failure will make the LED go red. It will become green again, when the power is cycled, or a dash of CA kicker is sprayed on the chip (I have no cooling spray).

So, if one of you guys sees a red LED, it is not because of the regulator.

However, I have to say, the RX is really hot when these failures occur. It hurts touching at these temperatures.
Keeping any part of a plane, despite parts of the gas engine, at these temperatures for a prolonged time, is just asking for trouble IMHO.

Every electronic component will fail at a certain temperature.

The 2724DH transciever, which was the component that failed, is rated -10 - 60°C (14 - 140F).
I'd say, it lives pretty much up to its specs.

	Quote:
	When the regulator cuts out, it must be a thermal overload protection system on it, could it 'click' as it switches off? I ask this because some people have reported hearing the 'click' on failure and a 'click' when it recovers.

Hmmm. Most solid state devices I know of do not make sounds. This regulator has 6 pins, a litte strange design. The datasheets I could find about similar regulators all say they have overcurrent and overtemp protection built in. And most work up to 120°C. (248F).

[reyn3545]

I think I'm going ot unsubscribe, and check in every month or so to see if Futaba has resolved the problem. I know we all want to share our testing and findings, but GEEEEZZZZ this is going nowhere fast.

[TheTank]

I have been using my R6014FS reciever without issues for a while now in you 3.2 Extra 300. At the same time, I dont see fuselage temps anywhere near what you guys are testing. Between my pipe tunnel and the climate up here (even in the dead of summer), I dont anticipate an issue up here.

[crhammond]

Juliez, thanks for the temp on the 2724DH transciever. That temp is right in line with where folks are seeing the cut out.

Just to repeat - I saw a case temp of 121f on my Rx (which is mounted under a smoked canopy) after it was int he sun for maybe 15 mins and the ambient temp was only 19c (70ish) outside. So if it is 100f or so outside... then maybe this is a temp folks can see inside the Rx.

I'm not worried where I live. I now know to monitor it and cover the canopy and it should not be an issue unless we get some freaky hot weather.

Interesting to see that the AR7000 shut down also. Hotter - but still...

[blkbird68]

	Quote:
	Interesting to see that the AR7000 shut down also. Hotter - but still...

The Cypress Technologies wireless usb 6953-48LFXC PRoC used in the JR/Spektrum and Airtronics 2.4 equipment has an operating temp range of 0-70c .10c greater than the max operating temp on the 2724DH. So, yes, the JR and Airtronics equipment also have thermal limitations just as any other electronic device known to man.

[shannah]

	Quote: Originally Posted by Julez
	The 2724DH transciever, which was the component that failed, is rated -10 - 60°C (14 - 140F).

Is the 2724DH used in the 6014 rx?

[Mode1Mike]

	Quote: Originally Posted by AEROCOLOR
	Emessys comment should end this discussion unless someone can provide a solution or test results. Period. We are all experimenting with new technology every day of our lives. Please stop the negative comments and bickering. It causes me shame to be associated with the hobby and what brand wars do to people. Grow up guys! Bill

I did not buy this stuff to experiment I paid full price for what Futaba is advertising PLEASE POST WHERE YOU FIND THAT FASST IS EXPERIMENTAL Please go to there web site and read for yourself!

http://2.4gigahertz.com/

The Futaba 2.4GHz Story

In our decades-long history, Futaba has brought many "firsts" to radio-control: Pulse-Code Modulation (PCM)...1024 and 2048 resolution...systems with 9 and 14 channels...transmitters with ultra-reliable dual internal processors. Now Futaba is the first of the traditional radio manufacturers to bring the advantages of 2.4GHz spread spectrum technology to modelers – and the first to introduce that technology in a full-range aircraft system. For getting the full benefits of 2.4GHz technology, you'll find that Futaba's experience makes all the difference. Ask competitors such as driver Taylor James, who has already racked up multiple wins with Futaba's 3PK 2.4GHz! Or award winning pilot Jason Shulman, who says "the fast response and glitch-free performance is unbelievable!"

Futaba gets it right the first time.

Futaba takes great pride in making sure that every new product performs flawlessly before it's offered to our customers. Others hesitate to invest so much effort in testing. Some may even consider their "first run" products a step in the process of working out bugs, using feedback from the earliest buyers. Futaba is different. When you choose a Futaba 2.4GHz FASST radio system or module/receiver set, you've selected a fully tested, well-engineered, totally reliable product – one that's absolutely ready to give demanding R/C hobbyists the performance they expect. Our hands-on experience with 2.4GHz technology stretches back 15 years, long before anyone considered its value in hobby applications. That's when engineers in Futaba's industrial R/C division – designers of radio-control tools for construction, civil engineering, and similar uses – began employing and perfecting their own 2.4GHz equipment. Those same engineers were brought in to share their knowledge as soon as we were comfortable that 2.4GHz technology had perfected for the unique demands of R/C hobby applications. No other radio manufacturer had such an instant supply of expertise.

[lazun]

This is a PM sent to us:

Thanks so much for posting about the FASST heat issue. I almost didn't believe you but now I have seen and repeated it with my own eyes. WOW.

"Slow cooking" at relatively low temps shuts these things down. I got all mine shutting down around 130f when you slowly raise the temp. That can happen even in a coldish climate if the sun is out a beaming down on the fuse.

I probably owe you my 40% IMAC bird as sooner or later the heat would have got me. (not to mention all my other airplanes.)