Faulty tail servo

[Reltub]

Hi i have a ds620 installed on my hirobo sceadu. After a short while of the heli being turned on the reciever lights start flashig and the tail servo starts moving back and forth and i lose all control as soon as tge servo is unplugged everything goes back to normal. Does any1 know why the servo could cause this?

Thanks

[LaurenceGough]

Hi,

What is your power set-up? Where is the power coming from? What voltage? What connectors? What kind of switches do you use if any?

It could well be a faulty servo or maybe a overall lack of power, maybe a bottleneck type problem.

Try pumping the cyclic servos with your hand providing resistance without the tail servo plugged in, if they struggle or stop moving then this points to another problem.

Cheers

[coolice]

Hey.

Sounds like the tail servo is shorting out the radio systems power supply, as when you unplug it the rest of the servos work normally.
Does the tail servo get hot by any chance? A sure sign of problems in most cases.
What gyro do you use and is it setup correctly for that servo type, eg not on the narrow centre pulse width (760u) but set to 1520?

It could be a motor winding has come adrift and is shorting out within the servo, or the gyro is set wrongly and has killed the servo. Which will happen if the above centre pulse width is set incorrectly.
.

[Reltub]

Hey, the battery is 4.8v 4200mah it plugs into a on off switch then that goes to the receiver. Will check tomorrow if it gets hot, the gyro is a 401 and i assume its set up correctly tbh ive never set 1 up and it came already on the heli, im slowly working my way through finless bobs videos and havent got to that 1 yet!

Thanks alot

[coolice]

Hey.

Ah, Laurence may have hit the nail on the head with the power supply question then. If you're running a NiCAD/NiMh battery with a 2.4ghz set you could be browning out the receiver, this is where power dips below 3.3 volts with most 2.4 systems and the receiver goes into failsafe.
I'm sure you're using all Align servos perhaps, which are digital and draw a lot of power when running. The linkages on the model aren't stiff, putting load on the servos while on the bench? This will cause them to draw more amps and highlight a possible power supply problem when the model is then airbourne with flight loads.

The GY401 only has a digital or analog tail servo dip switch, so its not going to be down to the wrong centre pulse width setting.
.