Mmm V2 Up In Smoke !!!

[George16]

Originally Posted by DickyT

Thanks! I brought both my lipos and my truck to work today to have them charged and ready for after work. I have several construction site nearby my office and pending no rain the truck will see 70-90 minutes of dirt and sand pile bashing. My tires are bald from peeling out on asphalt last night, so lots of wheel spin will be there to generate some heat. I will keep a close eye on temps do to this.

Now that's what you call sickness .

[TruckBasher]

So it wont matter if all the thread gets out of topic then. Funny you should say that cause you always complain thing gets out of hand...no prob with me...just saying that we should keep thing in check....

Originally Posted by George16

Now that's what you call sickness .

I am not well needless to say weather was non compliant today, or more yesterday. It was dry today, but several days of rain prior had all the bash spots flooded. CC does not advertise waterproofness on the MMM, neither does nue and my rx is in a box but not sealed. I thought it best to just leave it in the car and drive home. I played for about 10 minutes in the parking lot of my house while talking to a neighbor. not hard enough to get anything warmer than ambient though. all super slow smooth driving, oh my is this esc smooth.

is waterproffness even a word?

[What's_nitro?]

Originally Posted by DickyT

is waterproffness even a word?

Yes.

PS: I didn't know you could link smileys??!!!!

[TexasSP]

Originally Posted by TruckBasher

Funny you should say that cause you always complain thing gets out of hand

If this is directed toward me, I am lost as to what you are talking about. I post in threads all the time that go way off original topic, and could care less.

Got my MMM last week. Installed it and race this last weekend with everything running great. Convienced the MMM is a keeper I decided to pop the lid and make some of the mods mentioned in these forums. I unplugged the fan and ran the wiring directly to my receiver's ch3. I made the lid's opening a little bigger for the wires and that's about it. I plugged everything in and I get nothing from the MMM;ie no arming. I raced it last weekend and it did fine. I switched out receivers and do difference. Thinking maybe the switch went bad, I cut it off and soldered the two wires together and still nothing. I checked the batteries (the RX and the main) both are charged. Steering servo and fan works fine just no arming of the MMM. I've disabled the BEC and using power from 2S RX lipo (was doing that before with the MMM and it ran fine). When connected to Castle Link, the software still sees the MMM and can write to it. Any ideas?
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UPDATE: I was just about ready to box up the MMM and send to Castle then decided I'd try one more thing. I ran the 3-wire cable from the MMM directly to ch2 of the receiver and it armed and worked fine. Prior to this I was connecting this cable to ch2 via an extension with the middle (red) wire cut. This was because I did not want to use the onboard BEC and was using a 2S 950 Lipo and a voltage regulator to power the receiver. This/that setup worked great as I went through 4-5 battery packs over the last week prior to the MMM dying. The MMM will now only run with the 3-wire cable directly connected to ch2 (with red wire intact) AND with the 2S 950 Lipo/volt regulator connected to the Batt input of the receiver. When I throw the switch on the voltage regulator the MMM arms completely even with the switch on the MMM being OFF. Even though the ESC arms completely it of course will not respond to throttle until I throw the switch on the ESC. Can someone explain what happened between my first set up (explained in 1st post) and the new set up that I must use now to get proper response out of my MMM?

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Jammin X1CR, Neu 1512/1.5D, MMM/MM, NO BEC
XTM/XT2, Nemesis XL, Hydra120, NO BEC
2 FireFox 4s 3700, 2 Neu 4s 5000[/QUOTE]

[BrianG]

Dunno about paragraph 1, but your "update" sounds like the BEC in the MMM is toast and the only way it will work is to externally back-feed 6v into the MMM. When you do this, does the rx pack/regulator get hot, and/or does the BEC circuit on the MMM get hot (you'll have to take it out of the case)? Depending on the MMM BEC circuit design, putting a voltage into its output can cause lots of heat. To me it sounds like your MMM evolved into a form of Opto-ESC.

I would send it back since that is obviously not how it is supposed to work. Good luck and let us know how it turns out.

Originally Posted by BrianG

Dunno about paragraph 1, but your "update" sounds like the BEC in the MMM is toast and the only way it will work is to externally back-feed 6v into the MMM. When you do this, does the rx pack/regulator get hot, and/or does the BEC circuit on the MMM get hot (you'll have to take it out of the case)? Depending on the MMM BEC circuit design, putting a voltage into its output can cause lots of heat. To me it sounds like your MMM evolved into a form of Opto-ESC.

I would send it back since that is obviously not how it is supposed to work. Good luck and let us know how it turns out.

Thanks for the thoughts and ideas. It will be late tomorrow before I can check rx pack and regulator. Do you have a tip on identifing the BEC circuit in the MMM? I'll report back when I test it.
Thanks

[BrianG]

Well, when you take the MMM out of the case, the BEC circuit is directly on the bottom.

Originally Posted by BrianG

Well, when you take the MMM out of the case, the BEC circuit is directly on the bottom.

Thanks, I'll put it up on it's stand, pop the top of the MMM and run it for a while and check the temp on both the rx back and the BEC circuit.
Thanks Again

[brushlessboy16]

what physically causes them to fail? a connection break on the BEC?

Originally Posted by brushlessboy16

what physically causes them to fail? a connection break on the BEC?

I see no crimping of any wires so I don't think it is a connection break... just my thoughts. I've got a real delima ... I know the MMM is not working as it is suppose to but it is working (I'll find out tomorrow if it is causing overheating of the RX and/or BEC circuit). I leave for an out-of-town race two weeks from tomorrow. Do I send the MMM back to castle and hope to get a replacement before I leave or if it doesn't cause an overheating on the rx pack or BEC circuit do I use it for the race in two weeks and send it in afterwards. hmmmmmmmmmmmmm

[BrianG]

Dunno. That's a question for Patrick. I have a suspicion, but that's it.

Originally Posted by BrianG

Dunno. That's a question for Patrick. I have a suspicion, but that's it.

Patrick, if you are out there can you weigh in on this? I realize Castle has a lot on their plate getting the new MMM v2s out; however if I overnight my MMM (this is my 1st v2 after receiving 2 v1s) to Castle is it possible they could return it (or another) in a few days? Feel free to PM or email me.
Thanks

If i were you i would try to email Patrick directly as he might not be on here for another week . Or try calling CC directly