Hi all, i built the ft p40 warhawk yesterday and I cannot get any of the servos to work (except elevator) when connected to my rx. All the channels on the rx send power as i’ve tested it with the elevator servo. The throttle also works just fine. I can’t see the linkages for the ailerons as they are in the wing but i’m 99% sure they’re correctly connected to the extender. Any ideas as to what might be wrong or what I should try?
Solved Servo Problems
- Thread starter james1234
- Start date
JasonK
Participation Award Recipient
swap around your connectors, and see if that working elevator works on the other ports of your receiver.
This will let you know if the issue is that somehow your RX isn't sending signal on the different ports or if you have some sort of wiring issue (or bad servos) in the plane.
if different servos work when connected to the elevator port, then you have either a configuration issue with your TX/RX or one of them is damaged.
If the elevator servo works as it gets moved around and stuff doesn't work on the elevator port, then tyou have some sort of wiring issue (or bad servos) in the plane.
This will let you know if the issue is that somehow your RX isn't sending signal on the different ports or if you have some sort of wiring issue (or bad servos) in the plane.
if different servos work when connected to the elevator port, then you have either a configuration issue with your TX/RX or one of them is damaged.
If the elevator servo works as it gets moved around and stuff doesn't work on the elevator port, then tyou have some sort of wiring issue (or bad servos) in the plane.
If you have tested the other channels on the Rx, then the problem is with the servos or with the extender. It’s unplugged, backwards or has bad ends, bad servo, etc.
Yeah it must be with the servos or their wiring because I can’t seem to get them to work when they’re in the elevator port which I had just used. Anything else I should do now, i’m feeling kind of lost.
JasonK
Participation Award Recipient
start carefully taking things a part and testing them one by one to pin down what part/cable/etc is at fault.
I agree with @JasonK, best to test one thing at a time. When you test, make sure pay close attention to the servo plug, if one is pugged in backwards, it's not going to work.
Regarding the servo plug.
Red is always positive.
The darkest color, usually black or brown, is negative.
The lightest color, usually white or yellow, is the signal wire.
If you flip a plug, it's not going to blow up, it just will not work.
Took out the rudder servo, the extension wasn’t flipped and I tested it with and without the extension one more time to no avail. Is there another explanation besides the servo just not working?
JasonK
Participation Award Recipient
if the servo doesn't work you have one of a few things that could be the problem:
- TX not sending any signal
- RX not putting signal on the port (or not passing power)
- cabling issue between RX and servo
- bad servo
since your using a port on the RX that works for a different servo, that excludes the first 2. Which leaves a cabling issue (which you bypassed all the cables you could) and a bad servo. therefore it sounds like you have a bad servo.
Damn, is there any way I could have fried it? Before I put it in the plane it worked and I centered it.
JasonK
Participation Award Recipient
is there any way? sure.
did you? I don't know.
do you hear any noise in the servo when you try to move it? does it move by hand ok?
There’s no noise when it’s plugged in and a little when moved by hand, it moves alright by hand.
With a servo tester? Try the servo tester again.
No, I plugged it into the rx and trimmed it with the tx.
Ratcheeroo
Legendary member
what kind of radio are you using
Let's recap the situation.
You tested all of the servos with the Rx, in the correct channel, prior to install & all they worked.
After the install, only the elevator worked.
Either you have a bunch of bad servo plugs that only work sometime.
OR you are reversing the servo plug at the Rx.
spektrum dsmx dxs with an ar620 receiver
Yep, I assume it’s the servo plugs because they can’t fit in upside down in the receiver or extensions.
Ratcheeroo
Legendary member
and you are sure that the servo is plugged in the the correct channel on the receiver?
Ratcheeroo
Legendary member
those plugs can be inserted in either of those upside down
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