mamba max pro problem
 

ok heres the thing , i have noticed when using my mmp on a hightec 5955tg or 7955tg when you turn the wheel alot it will glitch and some times the motor will turn on and the servo just stops , ive tryed to run it on 5.5v-7.v and still the same thing , also had a guy runnin one here at the track also and it did the same thing , one more thing my fan allready stoped working i was runnin it on a 6.5 and noticed it seemed like some thing was wrong , i pulled it off the track and temped the ESC and it was at 210 never did get the fan to work , is it posable to send in just the fan ? thx joe

Are you running a 2.4GHz radio? It could be interference from the metal gears if you aren't. Otherwise there may be binding in the steering mechanism causing a BEC overload...though that doesn't really explain the motor movement. :neutral:

yep running 2.4 even did it with just the servo layin there not in the car , just with the arm moving left to right , idk what i could be ive seen it on 2 production mmp now , the beta model i have does not do it

I wonder what's changed between the beta and the production model?

Nothing changed between the Beta and production models...

Joey, have you tried swapping out the RX?

yea it has happend to both of my rx's and my buddy that i race with i will try and make a video and up load it

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The receiver light going out is a clear indication of no/low voltage from the BEC. However, what is causing that? It could be a faulty/weak BEC or maybe there is something wrong with the servo itself.

To eliminate the BEC as the culprit, try a receiver pack or external BEC. If it still has issues, I would suspect the servo.

I had a Hitec servo a while back where one of the internal gear pins had worn away the exle point in the case and elongated the hole. It would run fine sometimes, but then other times would bind up and stall the motor and do exactly as you describe, even with no load like you demonstrated.. Do you have any other servo you could try?

i have had the problem before, turned out to be the servo, i would try it with another servo, if it still does it then you have a bad bec

Would setting endpoints on the tx or checking for binding in the steering links help?

I have a similar issue with a hitec 985mg. I have the dx3s with telemetry so I can monitor bec voltage on the transmitter. With the power on, the telemetry shows 6.2v, when I start steering, just like in the video shown above, the bec voltage sometimes drops below 4v. This even happens without the wheels attached.

Thing. Is I'm not the only one with this problem some one else at my track had the same problem on his t4 with the mmp on a 7955tg , there is no binding I took it out of the truck and ran the servo by it self and still did it

well guys i got it fixed i went up to the LHS and got a "glitch buster " and works fine now , i guess the pro cant handle big servos :) 6 bucks to fix the problem thats not bad

http://www.horizonhobby.com/Products...ProdID=SPM1600

This looks like the same behavior I've been seeing with the MM Pro.

My setup uses a Pair of MG995 Servos. I blamed it on a bad servo even though I had just installed them both brand new. I then brought it in the house and swapped out the servos.

I haven't had a chance to run it again yet though. Hmmm..........

How many amps is the MM Pro BEC supposed to be good for?

I just did a quick test with various loads with the BEC set for 6v:

5.94v unloaded
5.76v @ 0.48A
5.72v @ 0.64A
5.70v @ 0.95A
5.63v @ 1.87A
4.16v @ 2.77A

Not sure exactly what point the BEC voltage hits its max, but I would say right around 2A. As you can see, the output falls dramatically somewhere around there.