Mamba max / dx3r problem - RC-Monster Forums

Sylvester · **Mamba max / dx3r problem -** 03.13.2009, 02:52 PM

hey guys im running a b44 with dx3r and mamba max 7700 combo on trakpower 4800 2s saddle packs. i ran the car for 5 minutes testing it and it shut off, then turned back on. i drove it for another 2 minutes and it shut off again and wont even light up anymore. the esc is fine as it calibrates with my computer and all the leds work, the lipos are fine as they are perfectly balanced and in working order, i checked all the connections and they are fine! im starting to think its the sr3100 receiver that is the problem but if i use an external pack it starts right up.

any help would be greatly appreciated.

bdebde · 03.13.2009, 03:10 PM

What is the arming delay time set to and the neutral band?

Sylvester · 03.13.2009, 03:12 PM

where is the arming delay?
and its set with the neutral band setting.. do i check all this on castle link?

bdebde · 03.13.2009, 03:21 PM

Yes in castlelink.

Sylvester · 03.13.2009, 03:24 PM

its set to 1.5 seconds and average TDB. i dont think thats the problem though since it doesnt power up at all when i plug in the battery..

magman · 03.13.2009, 04:00 PM

Do you have another rx to try?

streethot · 03.13.2009, 04:55 PM

I had have a problem very similar on my Kyosho TF5, I turned it on and every time I steer the car, mamba turned itseld off.......so.......to not harm the esc.....i put a external bec.....solved.......every time i tried to steer it was worst then before until the esc didnt turn on nevermore........i dont know the problem but i wont risk a good mm because its bec........btw i think mm bec is weak......and should be 6V not 5V......

BrianG · 03.13.2009, 05:51 PM

Quote:

Originally Posted by streethot

...and should be 6V not 5V......

Even LDO linear regulators need at least 0.5 above their rating to work right, and 2s lipo or 6 NiMH cells can get down to ~6v, which would't work well. So, they use 5v and problem solved. However, being linear, efficiency is poor at anything above 2s/6cells and should use an external switching BEC to avoid thermalling the ESC BEC...

Sylvester · 03.13.2009, 06:05 PM

ill try an external bec. thanks guys.

Sylvester · 03.13.2009, 06:21 PM

i tried an external rx pack and everything arms perfectly with all the beeps and the steering works but the throttle doesnt work.. is this mamba done or will a ccbec fix this?

squeeforever · 03.13.2009, 07:42 PM

Quote:

Originally Posted by Sylvester

i tried an external rx pack and everything arms perfectly with all the beeps and the steering works but the throttle doesnt work.. is this mamba done or will a ccbec fix this?

Did you pull the positive wire out of the ESC plug?