retaining mech brakes in 1/8 buggy conversions

[GorillaMaxx360]

k thanks for the explination.

[Sedri]

I've got a stumper of a question you you guys -

When I first set up my Kyosho Inferno, I used a Futaba "Magnum Junior" T2PEKA 2-Channel FM radio with a steering and a brake servo, using the Y-Connector to plug in a Warrior 9920BK. Set up this way, the Warrior was programmed for forward-only. "Reverse" on the transmitter throttle simply moved the throttle servo the other way, which applied the brakes.

Here's the Question - when I decided to run emf braking(motor braking), I removed the throttle servo and Y-connector and plugged the 9920BK directly into the receiver.

As per programming directions, I removed the red programming bridge, turned on the transmitter and reciever, plugged in the Lipo main battery and waited the "5 seconds" for the motor to beep to start programming.

NOthing! I tried a dozen times, then plugged in the y-connector again (with the servo plugged in and just lying on the table next to the car...

And instant, perfectly easy programming! Frustrated, I removed EVERYTHING from the car, dug out the cheapy Kyosho "perfex" 2-servo AM radio system that was originally in my Nitro Inferno, and pow, the 9920 programmed beautifully without the y-connector or throttle servo plugged in.

Why? Are there certain radio receivers that an electronic esc can't "recognize, or that ONLY work with a servo?

Right now I'm using the AM radio, which glitches from the brushless stuff, and my nice FM is sitting in a box, sniff. What to do?

[jhautz]

That is weird. Ive not heard of this before. I have never had any issues like this before. This is not fixing the problem, but could you just plug the servo in while programing and then unplug it anfter you finished programing it? Then you should be able to at least run the FM radio.

I'm wondering if others have seen this problem? I have heard of others having trouble programing their BK controllers, but I cant recall anyone identifying that a servo plugged in to that channel on a Y allowed them to program, or that it is specific rx or tx that causes the problem.

[Sedri]

Jhautz, that was exactly one of the thousand combinations that I tried, and the result was NOT pretty - it scared the you-know-what out of me...

On the "bench", I programmed the BK, then disconnected the servo & y-connector, plugged the BK directly into the receiver, and went out to the street to take a test spin...I just touched the throttle, and BAM instant full throttle. And a 6T 540XL on 4S at full throttle (with visions of a $1000+ down-the-drain spectacular crash) was no fun.

Luckily, the glitch was just for a second, but then the throttle started jumping and surging, even with my finger off the throttle. Yeow!

[jhautz]

:dft002: OK then.... DOnt do that!!!!!:005:

Hopefully someone else has a solution for you. Somebody else around here must have run into this.

[coolhandcountry]

I have seen an issue of the plugs not going all theway in to a rx. This makes
it hard to program and run. It will become very glitchy. The reason it works
with the y harness is that the y harness goes all the way into the rx. Try
the y with no servo and see. Hope this helps.

[Sylvester]

I too think that the plug didnt go in all the way ; same thing happened with my old 9920, didnt push it in all the way and glitched like a B!tch.

[Sedri]

CHC and Sylvester -

I wondered about that as well, considering that the 9920 came with what looks like a "Hitech" style plug and I was attempting to plug it into a Futaba receiver, so to test for a possible poor connection, I plugged in the y-connector (which, ironically, also had the "hitech" style plug but worked perfectly), but I left off the servo - that is, I didn't plug in the servo to the other female on the y-connector.

Nothing. No beep, no signal, nothing.

So, I then simply plugged the servo into the y-connector, without touching ANYTHING else. Turned on transmitter, receiver pack, main battery-

perfectly easy programming. So, I simply unplugged the servo, again nothing - impossible to program.

Nuts

Here's the REALLY (really really) weird part - with the 9920 plugged directly into the receiver (where it wouldn't program), the motor DID signal (beep) the programming initialization when I touched the steering wheel, and it programmed "through" channel one (steering), even though the steering servo was still plugged into channel one, and the 9920 was clearly (I checked several times because I couldn't believe what was going on) plugged into the throttle channel (channel two)

Now after letting it program this way, it still didn't work - not that I could have driven it!

Receiver is 100% okay - I rechecked it by plugging in two servos; everything happy and working great. My 9920 also works great (besides the annoying glitching) on the AM Perfex system.

Nuts

How about this question then - how many of you use a Futaba system? If not, which systems do you use, and are HAPPY with? I love Futaba, but I'm hesitant to buy another and have the same problem!

[coolhandcountry]

What if you plug the esc into the steering part of the rx?
Can you program and operate it like that?

[glassdoctor]

What were you drinking when this happened? ;)

[QUOTE=Sedri]
Here's the REALLY (really really) weird part - with the 9920 plugged directly into the receiver (where it wouldn't program), the motor DID signal (beep) the programming initialization when I touched the steering wheel, and it programmed "through" channel one (steering), even though the steering servo was still plugged into channel one, and the 9920 was clearly (I checked several times because I couldn't believe what was going on) plugged into the throttle channel (channel two)
[QUOTE]

I don't see how it's possible for channels to get "mixed up" due to anythign plugged into the rx.

When it was programming via the steering wheel, what was happening with the steering servo? Did it move also? Did it not move at all? Did it move via the throttle trigger?

So...
1. plug in only the steering servo... to channel one slot in rx. Works ok?
2. plug in servo to channel two slot in rx. Both servos work ok?
3. replace channel two (throttle) servo with the 9920.... and it now is controlled via the steering wheel?

That can't (shouldn't) be possible. Is this what happens? :007:

[jhautz]

Sounds like you have some kind of channel mixing going on between the steering channel and the throtle channel. Either that or you have a bad Rx. This just doesn't ake any sense.

Can you program the esc by plugging it into the steering channel and using the wheel?

[Sedri]

Haha!

I know you won't believe me when I tell you that I don't even drink or smoke, considering what i've been describing, but yours truly was stone cold 100% sober and under the influence of nothing but confused curiosity!


All right All right All right, I'll stop pestering you all with this weird problem; I suppose that I need to just cough up the money and get a newer, up-to-date radio system and be done with the whole thing. I just really want to know what's going on.

Mmm, IF any of you are curious, though, to continue this nonsense experiment, I'm going to put my radio up for sale on eBay to get a few dollars toward a new system. Any takers? It's lot's of fun, I promise you - you'll never be bored.

[glassdoctor]

Hee hee... I'll pay shipping plus my $.02 :)

[coolhandcountry]

Do you have another rx to try with radio?
Is the black wire plugged into the rx plug good or has any bad spots?
It is no garuntee that a new radio will fix your problem.

[BrianG]

Where are you located? Maybe there's someone here that lives relatively close-by that wouldn't mind helping you out.

Or, take it to a LHS and see if they'll try a different Rx/Tx set. Most I've seen have a few personal vehicles laying behing the counter that they could temporarily hook up.

If it turns out NOT to be the Rx/Tx, you will have saved a few bucks.