Servo Memory? - RC Groups
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Feb 17, 2013, 07:21 PM
Registered User

Servo Memory?

Not sure what happened but the flaps on my FMS plane wont come down all the way. The receiver is an AR600 with a DX6i. Previously I had limited the travel distance in the transmitter to 15 percent. Putting the travel back to 100 percent only moved them down about 20 percent. Initially when I setup the model the flaps would come down almost 40 degrees. In rebinding the receiver a few times with the flap travel limited does the servo think full down is the 20 percent mark?
Any ideas? Would binding the receiver to another model number put things back?
Last edited by GrandpaInFlorida; Feb 17, 2013 at 07:26 PM.
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Feb 17, 2013, 08:08 PM
Senile Member
Lnagel's Avatar
Servos are stupid. They ain't go no brain and therefore the ain't got no memory. They only do what the signal from the transmitter tells them to do. Binding is a receiver thing to get it to recognize the controling transmitter. If the receiver has a memory it is used only during failsafe when it loses the transmitter signal. Under normal operation the receiver simply decodes and relays the transmitter's signal to the appropriate servos. What it boils down to is that your problem is probably in the transmitter programing. You might try setting all of the transmitter programing for the flap channel back to zero, then reprogram the flaps for your desired movement.

Feb 17, 2013, 08:10 PM
Registered User
may try unhooking the servos and see if they move all the way,if so work the flaps up and down (with out servo hooked up) maybe something is binding. Servo,s have no memory.
Feb 17, 2013, 09:26 PM
Registered User
I had this happen to me and as I am new to the hobby it took me a bit to figure out but the issue ended up being that I connected the servo jack into the wrong slot on the rx .....
Feb 18, 2013, 09:39 AM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
Agree with the others, servos are dumb, they have no memory. As noted above disconnect the flap and see if the servo then travels it's full range, if so there must be some stiffness in the flap or linkage that's preventing the movement. If the servo still only moves part range even with the servo disconnected then you probably still have something set in the programming that's limiting travel. Try binding the Rx to a unused 'clean' model profile in the Tx memory and see if the flap then moves fully; if so this confirms that it's something in the programming.
Feb 18, 2013, 09:45 AM
RWData's Avatar
Sure to be a TX thing. It's easy to miss something, after all there's dual-rates, expo, sub-trim, end-points, .... I would check out and write down current settings, then get the model memory defaulted or erased, then start to dial in the required settings. I would nearly bet you have something on the rates which is why you don't have the servo movement.
Feb 19, 2013, 11:41 PM
Heli's rule!
dacaur's Avatar
resetting the model memory will slove 99.9% of these types of problems...
Feb 20, 2013, 06:31 AM
Registered User
Originally Posted by dacaur
resetting the model memory will slove 99.9% of these types of problems...
That's what I did and it's back to normal. Thanks to all for the suggestions.

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