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Mikado . Futaba-RC . HeliProz
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Radio - Servo - Gyro - Gov - Batt

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SERVOS SHAKING

cyberfox78

Senior Heliman

Brazil

I finished the installation of eletronic parts on my TREX 600N

when i turned on the TX and RX for the first time, all servos start to shake. i take off the horns thinking that can be a levelling problem but still shaking

its a futaba 8channel receiver 72MHZ.

can be a CCPM configuration problem? i configured as a HR3 helicopter in my Futaba 7chp radio according with Align manual.

09-10-2008 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

Are these digital servos by any chance? And to what degree is the "shaking" happening? Is it just an annoying buzz, or are the servo outputs physically moving erratically by random amounts?

Digital servos are notorious for buzzing when sitting idle, you don't see the servo arms move, but there is a noticeable buzz. It's completely normal, and nothing to be concerned with.

Random, erratic movements are a whole 'nother story, and you need to get to the bottom of it prior to flying.

Choosing the wrong swash mix value won't make a difference, especially since you don't have any servo horns attached. It just mixes the three servo movements together in a way that won't move your swash correctly.

You want three-servo, 120 degree swash selection for your 600N, by the way. HR3 for a 7CHP is correct.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

09-10-2008 Over year old.
Machinehead01

Veteran

Lower Michigan

Sounds like RF

Sounds like you may have some RF interference going on. Could be from the carbon fiber frame if you have one. Check to see that your rx antenna is clear of the frame, check to make sure that ALL the frame bolt connections are tight. If after all this is done and you still have shake then it's very likely your TX or RX is at fault. Send it in for repair as one or more of the signal generation IC's may be bad.

Thomas

The price of freedom will always be paid in blood, just ask Christ

09-10-2008 Over year old.
GMPheli

Elite Veteran

W. Bridgewater, MA USA

Is there a flourescent light nearby? if so shut it off and see what happens

09-10-2008 Over year old.
cyberfox78

Senior Heliman

Brazil

[B]They are digital servos.
with de horns atached the links didn't move
when i take off the horns, i can se the gyratory head moving, very short move but moving. side by side.

this is not that kind of noise common hear in digital servos

i have the same servos in my Raptor and they didnt do this noise and they dont shake

09-10-2008 Over year old.
RobRoy

Key Veteran

Huntsville, Alabama

Are you able to still control the servo's? if not, make sure you are in the right rx mode, PPM or PCM

Ignorance is curable, stupidity is for life.

09-10-2008 Over year old.
bkervaski

Elite Veteran

Birmingham, AL, USA

They are just scared of the impending smack down you're going to lay on them.

Synergy / Rail Blades / Castle Creations / Scorpion / Thunder Power / Byron Fuels

09-10-2008 Over year old.
HOMEPAGE  
psych-lick

Key Veteran

Portland, OR

I think RobRoy hit it - you are probably not in the correct transmitting mode (ie.. transmitter set to PCM on a non-PCM receiver)

-Jeff T.

09-10-2008 Over year old.
Heli 770

rrProfessor

Lemon Grove, Ca. USA.

cyberfox78
Check the crystal on the Rx and make sure the pins are not corroded.

09-10-2008 Over year old.
cyberfox78

Senior Heliman

Brazil

[B]IF I MOVE THE STICK, THE SERVOS MOVES TOO
SO, I DONT THINK THAT MUST BE A TYPE OF TRAMSITION PROBLEM.
I SETUP AS PCM.

09-11-2008 Over year old.
psych-lick

Key Veteran

Portland, OR

then you either have a bad receiver or you are getting the over-voltage jitters

can you measure the voltage going to your receiver?

-Jeff T.

09-11-2008 Over year old.
GMPheli

Elite Veteran

W. Bridgewater, MA USA

Try disconnecting everything plugged into the receiver (servos, gyro, voltage monitor, gov, etc) one at a time to see if anyone of them is causing it.

09-11-2008 Over year old.
Nightstalker

Elite Veteran

UK (BEDFORDSHIRE)

cyberfox78 as i said in ur other thread in trex section


if your switching on inside don't have the areal up and don't have the TX so close to the heli, its as if your TX is shouting at the RX and can make the servos have gitters.
I have that with mine being so close to the heli when inside.
keep areal down and move the tx about 2ft away from the heli see if its still the same

09-12-2008 Over year old.
travelmate

Heliman

Chung-hua county, Taiwan

Which servo are you using ?

Maybe it's the problem about the servo control way.

09-15-2008 Over year old.
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SERVOS SHAKING

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