Heard a rattle in my M.M.M.
 

I'm going through my E-Revo doing some mods and changing up some stuff and removed the ESC from the chassis, I heard a rattle like a pebble or somthing in the case so I opened it up. Plunk, out falls this do-hicky. You can see where it came from via the screw driver and I have no clue what it is or whats it's for but I guess It's best that I send it back to Castle for Inspection/repair.
Funny thing is I have no clue how long this has ben like this, I last ran the truck 2 weeks ago and it was a perfect run. 50 minutes and cool temps when complete. Put the truck away and that was that. Finially received all the parts I ordered and started disassembly and found it as you see it ?

Any insight is welcomed, Thanks.

http://i88.photobucket.com/albums/k1...z/P8090002.jpg

http://i88.photobucket.com/albums/k1...z/P8090008.jpg

:oops:

Are there any markings on that little chip?

Mr Neil,
It has this stamped into the plastic.

http://i88.photobucket.com/albums/k1...z/P8090009.jpg

Hmm....

No idea, I was just thinking that it would be easier for someone like Lutach or BrianG to identify it if they cold see the markings- I know a Castle rep would be able to without any problems, would be worth emailing them and pointing them to this thread. Given its size & posistion though, it seems like it might be at risk of being jarred loose upon a hard landing or sudden jolt.

Thank you for your input, I'm PM Brian and see what the Guru has to say. Regardless It's gotta go to castle but the curiosity is killing me as to WTF it is ?

looks like some kind of Surface mount resistor to me.

I have no idea. Could be a cap, resistor, diode, TVs, inductor... pretty much any 2 pin device. The markings don't say much. If I was to guess, I'd probably say diode, TVS, or inductor.

Brian nailed all the components that could be and it looks like it can be resoldered to the PCB.

Thanks Guys, I lost the little chip on my Bench. DAMMIT ! Hope Castle will not need it ? I'm gonna ship it out Monday,hopefully turn over will be quick so I can resist the urge to pull one out of my other trucks.

Wonder if this is the little part thats coming lose thats causing so many problems for these poor guys having meltdowns ??????

hmmm...I guess that makes 4.

Jeff

Did you read the directions how to open the case each time? Hope you didn't do with a screw driver going in too deep.

Nope, I heard the rattle of the do-hicky befor I opened it.
And luckily for me I have some common sense. :yipi:

Yeah I figured. Just a thought. I Hope you get it worked out!

COuld there be a defect in the soldering process thats not allowing these items to bond properly? My MMM has been at cc for almost a month now and it JUST got onto the repair floor...


Yeah but i think his missing component is in a different location

http://i152.photobucket.com/albums/s...010/hilite.png

I am fully aware of that and also that it is another inductor and that "there have only been 3 componets come off the board" and the shock loads are extreme. To which I have replied my findings. If I am wrong then I am wrong, but the leads are still there and and looks cleanly broken from the solder. Could be a manufacturer defect on the part itself, who knows but it's not bonding there obviously. 100G's I have already shown the load of 100 G's on a part of that size.

Jeff

Actually that component has the markings of our 10V and 30V TVS

Well, not only are you missing a part, but the inductor is also physically broken. The inductor is the part right next to the missing part (square with a circular interior.) It should be symmetrical, the bottom left corner (in your picture) is missing. Without that piece of ferrite, the magnetic path is broken, and the part won't perform correctly.

I would suggest that you return it for repair. The impact that broke free the TVS was hard enough to break the inductor. What did you hit?? :lol:

I didn't even notice that, worked just fine the last run ?
The last time I ran it I didn't even hit a lot of jumps, Where I gently pried the case open was on the opposite side of the broken parts. I'm sure you've heard this a million times but,
"I don't know what happened to it ?"
Ben really busy, I'm gonna try to mail it out befor the end of the week.

ESC will be shipped to fellas Friday morning, I see on the website I can expect a month or so wait so I reckon I'll be borrowing one from another truck. Gotta have the Revo up and running !

could the MMM not just come potted http://en.wikipedia.org/wiki/Potting_(electronics)

or is there some sort of heat issue.. my buds 8ight-t wth a MMM stopped working after one crazy jump.... out of a skate park bowel at WOT.. it was nuts.. but it landed on all 4

could we make some kind of external shock absorbing thing to hold the MMM in place but give it a little cushioning?
some kinda flexible mounting....i have always had my MMM mounted on some double sided sticky **** plus the cables ties so it had an ever so slight amount of give to it.
when it comes back from castle i'll look into it...

Put a layer of foam under it maybe?

Mine came with double sided sticky foam.

A guy on a german forum modifyed his MMM by making a little box around it & filling it with some form of epoxy compund. Once removed fromt he box, it looked like a black lump of resin with a heatsink and wires sticking out; great for water proofing and protecting the delicate chips, but no chance of servicing it ever again = warrenty void.

Sounds overboard and in the wrong direction ? I don't understand why he'd do that and purposely void his warrenty by encapsulating it like that ?
It makes more sense to roll with the punches and leave it alone rather than not make it servicable. To each his own I reckon ?

Even worse, he was selling them to people like that, though he had been informed by Castle that it would void the warrenty, whether he told his customers that fact I dont know... :sarcastic:

the ERBE has a nice little two bolt mount.. it clamps it down in a small foam pad... i think thats how im going to hold down my MMM on my MBX6-t


here is a nice pic.... of the mount... LOL
http://i212.photobucket.com/albums/c...RBE-MMM_08.jpg

Alrighty then.... :lol:

yes i used to love that mount!, so clean and neat...
but take another look now...does it provide any give and allow to cushion blows from big stacks?

can we make it have a bit of give?
wonder if we used a locating tray for the MMM then held down with strong rubber bands and then a strong safety device?
so when you hit hard the MMM can move before being pulled back into it's locating tray?
shaun

I think most of the shock is from the bottom up.. from landing big jumps.. if you landed on the roof the shock load would be on the bracket against the ESC.

so those large jumps you do while racing and you cringe at before the landing...
they are the ones you think are causing the problems?
i would have though hard impacts period would have done it.
like the old "face full of downramp", the "wing bouncer" and the old classic "hard bottom scrape" would have been the culprits.

haha true you have a point there. My buds went out from a hard belly slap.