I am having some problems in my stadium truck. At a random time I will lose control of everything and it will have to be turned off and back on. The problems all started when I swapped out servos with a ko-propo servo that I bought off of a member here. When I first hooked it up it would pause occasionally when turning the wheels back and forth. I swapped the servo with another one and the problem continued.

My setup.

Castle Creations Mamba Max Pro
Castle Creations 5700 motor
Spektrum SR300 receiver
AMB transponder
ko-propo 2367 servo
Spektrum DX3R radio

I tried swapping out the receiver with a SR3000, didn't fix the problem. I tried swapping out the Mamba Max Pro with a Sidewinder, didn't fix the problem. I tried unhooking the transponder, did not fix the problem. I tried another servo, didn't fix the problem. I rebinded several times, I reset everything on the radio, didn't fix the problem. I even tried a capacitor on the receiver, no luck.

Eventually I swapped out the receiver with yet another SR3000, swapped the MMP with the sidewinder, and put in a yet another servo and it finally operated properly.

The only thing that I can come up with is that the ko-propo servo is actually damaging receivers. Is that possible?

We have had similar issues when running off-road
what we did was to put 2 layers of sevo tape to 'insulate' the receiver from the bumps ect

other than that I have no idea

Thankx, Bill

The question of the Castle BEC has come up recently...
The other possible culprit may be in the Spektrum.

The servo lagging is usually an under volt/amp problem.

Spektrum receivers like constant voltage.
If you have a high draw servo (the Ko 2367 isn't slow or weak), & a weak BEC (Castle) the Spektrum receiver drops.
Do you have a different brand ESC to try or an external receiver pack.

Spektrum receivers may be sensitive to something going on with this, a friends Spektrum receiver has also died shortly after a similar setup.
I don't know the layout on the boards of Spektrum receivers for any internal regulation or limiters...

Castle states there isn't a wide spread problem at this point, but that they have had reports, but "didn't have any servos on hand" that would cause this situation.
I would speculate if you had a an external 5.5/6volt 3+amp BEC the system might be fine.
Only my old 1amp BEC Novak ESC's would do this type of stuff...

Here is an example of a high draw servo & insufficient supply.
http://www.rctech.net/forum/radio-el...bms-617-a.html

Thanks Bill. I have even tried a different receiver and had the same problem on the bench before I ever even put it on the track.

Thanks. I am running the esc at 6 volts on the BEC plus I tried using a capacitor, still did not work. I am even running two other cars with ko-propo servos with mmp's and spektrum receivers and they work fine.

I'm really thinking that I purchased a bad servo. I've sent an e-mail to ko-propo asking them what I need to do to get it serviced / replaced. If it's cost eficient I'll have them to service it. If not I'll just chalk it up as a lesson learned.

As far as castle, I originally thought that the problem was the mmp and I have a replacement coming to me from Castle. However, after buying a new sidewinder and still having the same problem I need to give them a call and have them to cancel the warranty request.

So far it seems like saving money on a used servo has really cost me a good bit of money. Two receivers, purchasing a capacitor hoping that would fix it (only $6), and purchasing another esc since I was thinking that was the problem. I probably should learn from this and quit buying used electronics but I probably won't.

Last week we had a high draw servo on a RTR SC10 ESC, & a Spektrum receiver... even after adding a good sized "cap" we had to pull the servo due to under volting the RX instantly.

The servo went into a different truck with better ESC, & same model receiver & it was flawless.

The servo might be just drawing a little more than the others, but it might not be bad...

Very good suggestion so I just experimented a little to see what would happen. Both the receiver and the servo specs say that they can handle high voltage so I upped the voltage on the bec. I tried 6.5 and 7.0 volts. I have the receiver, esc, and servo setting here on the carpet hooked up to a fully charged battery. After about two seconds of turning the steering back and forth I lose control of everything and I have to turn it off and back on again to get it working.

Without trying an external RX pack, different brand ESC, or external BEC upping the voltage won't help if the BEC is overloaded & shutting down in the ESC you have now.

If you do an external RX pack, you'd have to check the wiring layout on that... it may be as simple as keeping the on/off switch "off" on the ESC.
You'll have to look into it.

Thanks. I don't have an external rx pack since I am all electric. I do know that it isn't the on/off switch on the esc though since it did the same with both of my esc's, the sidewinder and the mmp. I just hooked the mmp back up to the new (old hitec) servo and everything works fine. I also rebinded one of the other receivers (the sr300) and it seems to be fine. The problem definitely seems to have something to do with the servo. So, if ko-propo says they will check it out for a reasonable amount I'll send it in. If they don't then I'll just toss it in the trash (luckily I "only" paid $80 for it) and call it a day.

The electronics worked perfect in all three heats and the main today. I used the mamba max pro, spektrum receiver and a hitec servo. Looks like I get to shop for a new servo though since the hitec I ran is just a cheap backup.