I am in the process of making my first nitro MT and am up to the lovely stage where I install the radio. My problem is that when I test the servos and receiver nothing happens. I know that all components work because I have tried them out on one of my electric cars. I do get one servo workin however when I plug the battery into a servo port, instead of battery port. The receiver does have BEC and I am suspecting this may have something to do with it (though i dont see how). I have tried to connect the battery in every position in the battery port, yet still nothing happens. Is anybody familiar with this and do they know the remedy?



thanks if you help me

does anyone know the maximum voltage a receiver is supposed to take? I plugged the standard 6v battery pack that came with my radio into another reciever and now that seems to have doed too. What is going on???

Ok first of all is the polarity right for the receiver and the servos???


Also is the battery pack charged???

yeah i tried all positions in the battery input, also they are fresh batteries - one disposable pack of four and two rechargeable sets

doesn't sound good at all! Never plug neg polarity into your receiver! You might also check all your connections

Don't blame the radio...

You CANNOT plug things in backwards and expect it to work!

(Damn it, the entry level to RC is now so low, one would start thinking brains are becoming optional.)


The RX's battery plug shares the same rails as the servo plugs, so make sure the red and black wires are exactly how the servo plugs go in next door too.

A "BEC" RX just means you can input up to 7.2V (or maybe even 8.4V) and the RX has its own voltage regulators to keep things level at 6V internally.

Have not yet seen any RX with fusible links inside before, but this can't be discounted either. Get someone else who at least knows what he's doing around electronics to check it out for you.



Powering up with wrong polarity will usually (instantly!) blow the transistors in your servos first - did you smell any electronics frying? Sometimes the RX survives, if you're lucky.

I dont think Sama3l came to Rctech for ridicule from you! The whole idea of Rctech is to share ideas and help each other out. If you have a gripe like this in future it would be better left un-typed, or you can PM the message to the other party. I dont want to see other people being notioned as stupid.....

With that comment you made, im now thinking if you took up the option to have brains or not.

Hey, when anyone says "I have tried to connect the battery in every position in the battery port, yet still nothing happens." the mind (present or not) boggles.

And the First thing they try to do... BLAME the RADIO???!

WC Please. I agree with Team Sherman, no question is a stupid question everyones different.. And when someone is just starting out we dont need comments like this..

Lets just try and help the poor guy out eh..

Gabes

Why not blame the radio? If I match the diagram they show me in the radio's manual with what I have in front of me, besides the fact that I have put together at least 6 cars in the last 2 years, this being the second that required me to plug the battery pack into the receiver itself and it still goes wrong, then I think that finding a fault in the radio is quite validated. Does anybody have anything that can actually help me?


oh yeah,

thanks for sticking up for me

Ok you can try a different set of crystals in your radio and check that out........

Thanx for the picture samma!!!! smartass ROFLMFAO!!!!

Didn't say its a stupid question... lord knows we get enough of that after all my days helping out at PC *and* RC tech support!!

Ok truce; bygones.

May Common Sense prevail!!

Always happy to help... I did put more than 1 paragraph above!!

Well, first things... (1) what BRAND are the radio RXs? Are they all the same??

(2) what Brand is the servos & switch you're hooking up? Do they even share the same type of plugs??

(3) check that the battery is good. Is there at least 4.8V at the *plug*??

Like what I said before -seems no one noticed?- "make sure the red & black wires for battery are exactly how the red & black servo plugs go in too."

I'll repeat... when you have all 3 plugs installed in the RX side-by-side, all the reds + all the blacks + all the white/blue/orange(signal) wires should be lined up in a row.

Double-check EVERYTHING before powering on!

Servos and batteries are interchangeable between brands, as long as you get the wiring correct!! (You don't get second chances with these, if wrongly connected you'll blow something instantly upon powerup.)


(4) Got a "known good" setup in another car? Ok then, just plug your servo in and test it... does it work? Test both/all servos. If they all don't work, they're all toasted -sorry.

(5) Now take your known working servo and plug it into your 'unknown' RX. It is best to use a servo of the same brand as the RX, so at least you know its got the right plug.

(6) now plug a battery line into the RX... making sure it should line up with the servo's plug wire colours. Red by red, black by black. It is best to use the RX's original switch harness.

(7) power-on... and the servo should *twitch*. That shows its getting power, and correct polarity.

(8) you must have a matched pair of xtals in RX and TX also, if you're hoping to receive a signal. Check xtals and turn on your TX.

(9) try it all again with your other RX.

(10) I'm guessing you haven't mixed AM and FM/PCM...? Don't mix AM and FM gear and xtals, it just don't work.

End of the day, its all a matter of elimination.
Plus need to work out what damage you could have done.

If nothing works, I'd suggest taking the lot to a LHS and ask them to work it out for you. Chances are you might have blown all the servos if not the RXs too.



But please... if it don't work plugged in one way, never ever Ever EVER just try plugging it in every each other way either. One can chalk it up to "inexperience" but heck, it still ain't a pretty sight on the sensibility scene.

Servo leads are designed to go in ONE WAY only. That you are able to plug it in multiple ways suggest either you have a old Sanwa/KO-type plug or that plug has been modified by someone.


Might I repeat... "NO WAY its the radio maker's fault"...

I will be checking everything again tonight just to make sure. is it possible to kill a crystal though?