throttle issue - RC-Monster Forums

ReDrUm_Racer · **throttle issue -** 12.16.2006, 09:58 PM

well today i was driving my brushless hyper 7 and it was running like a champ. I started driving it up a hill and when i stopped and tried to reverse, the throttle did not respond. I walked over and looked at it, and all the connections were fine, but the throttle did not work anymore. The steering still works fine, so I know at least the bec works. I checked over the motor connections, they seem fine, the rx connection is fine, and the batteries obviously are fine because the steering works. Btw I'm using the integrated bec in a 9918. Any help would be great!

:002:

coolhandcountry · 12.16.2006, 11:03 PM

Do you know the temps? If you let it set would it start back?

ReDrUm_Racer · 12.16.2006, 11:09 PM

Yeah, i had only been running it for 1 min or so and everything was cool. I let it sit for a few minutes and it still wouldnt work...

BrianG · 12.16.2006, 11:12 PM

Try hooking the ESC to the steering output of the receiver and see if you get anything (you'll have to use the steering to move forward/backwards though). That'll at least eliminate the receiver as a problem. Sounds like something else though honestly...

ReDrUm_Racer · 12.17.2006, 12:45 AM

ugh... i hope i don't have a dead esc or motor... I'll try that thing tomorrow.

BrianG · 01:35 AM

As you said, the steering servo still has power so you know the batteries, bec in the ESC, CH1 on the receiver, and all wiring in between is fine. That leaves CH2 on the receiver, the ESC motor output, the motor itself, and all the wiring in between as the problem.

You could also check the red jumper on the ESC. I don't remember what the ESC does if it comes off or has a bad connection, but it's something to look at.

Usually, it's a bad connection somewhere. Even though everything looks ok, you could still have a bad solder joint on the motor connectors.

Does the motor beep when the system is powered up?

If yes, the ESC is probably ok, but it could still be a connection issue since it requires a lot less power to beep the motor than to drive it. Resolder the motor connectors or directly solder the wires together.

If no, then you could have an ESC or motor problem, or a connection problem.

Between the motor and ESC, I would suspect the ESC first since that is where there is a lot more things to go wrong. The motor is just a bunch of coils. If one coil burnt out, you should still see a little movement on the working coils.

ReDrUm_Racer · 12.17.2006, 01:55 AM

Quote:

Originally Posted by BrianG

As you said, the steering servo still has power so you know the batteries, bec in the ESC, CH1 on the receiver, and all wiring in between is fine. That leaves CH2 on the receiver, the ESC motor output, the motor itself, and all the wiring in between as the problem.

You could also check the red jumper on the ESC. I don't remember what the ESC does if it comes off or has a bad connection, but it's something to look at.

Usually, it's a bad connection somewhere. Even though everything looks ok, you could still have a bad solder joint on the motor connectors.

Does the motor beep when the system is powered up?

If yes, the ESC is probably ok, but it could still be a connection issue since it requires a lot less power to beep the motor than to drive it. Resolder the motor connectors or directly solder the wires together.

If no, then you could have an ESC or motor problem, or a connection problem.

Between the motor and ESC, I would suspect the ESC first since that is where there is a lot more things to go wrong. The motor is just a bunch of coils. If one coil burnt out, you should still see a little movement on the working coils.

No, it doesnt beep, its basically like the motor is disconnected and the throttle connection is removed. Only steering works and throttle does absolutely nothing and the motor has no power at all. I'll check all these things tomorrow and let you know what happens. Thanks.

ReDrUm_Racer · 12.17.2006, 01:43 PM

Alright... the radio's fine... :(

jhautz · 12.17.2006, 05:35 PM

Does the esc smell burnt?

ReDrUm_Racer · 12.17.2006, 05:53 PM

nope.

BrianG · 06:30 PM

Check the red programming jumper. And really check the motor wire to ESC connections/solder joints as well as the battery connection.

If those look ok, it looks like something is wrong with the ESC or motor. How long have you had them?

ReDrUm_Racer · 12.17.2006, 06:28 PM

I've had them for a couple months, but I bought them used, so I dont know. I'll be talking to the guy i bought them from though. I'll check the solder joints now though.

BrianG · 12.17.2006, 06:32 PM

Yeah, it's kinda unusual for a motor or ESC to just "go bad" with no warning. You'd think something would get hot or a little puff of smoke would warn you. IIRC, there was a similar case like this a while back and I think it turned out to be a motor to ESC connection issue even though everything looked fine.

Good luck. And if all else fails, at least there is the holiday sale for the 9920 going on right now...

ReDrUm_Racer · 12.17.2006, 07:59 PM

I had only been driving it for 30 secs or so so I doubt it was overheated or anything. If there was smoke i would have noticed and it doesnt smell like smoke... Anyway I resoldered everything and still nothing... :-(

BrianG · 12.17.2006, 08:05 PM

See if you can carefully cut the heatshrink off the ESC and look for burnt or discolored components. Check the motor wire solder joints to the circuit board while you are there. If you don't really know what to look for, take some hi-res pics of various views of the ESC and post them if you can.