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KO PROPO Digital Servo Noise

KO PROPO Digital Servo Noise

Old 08-29-2015, 10:26 AM
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Default KO PROPO Digital Servo Noise

Just received a KO PROPO 30203 BSx2 digital brushless servo.
Decided to hook up all the electronics to make sure everything works before installing on the car.
Everytime power is turn on, the servo will make sound from within.
Did a check on internet and this forum and found many similar but not exactly sure if they are the same problem.
Hence, decided to post here for advice.

The sound seems to be due to movement from the motor and the internal gears.
The external gear does not move though, at least, not noticeable.
The movement and sound is even stronger and more continuous when transmitter is turned on.
The external gear will respond correctly to the steering wheel, although with the sound.

As mentioned, I have not installed anything on the servo so it is not under any load.
It does not feel hot either.
I hope the servo is not faulty. Have read that digital servos make noise because it is constantly trying to center itself.
But mine makes noise even not under any load.

I am checking and waiting response from the retailer.
In the mean time, hopefully some experts can provide some advice.
I took a video of the issue. You may need to turn up the volume initially but it gets more audible when the transmitter is powered up.

http://youtu.be/U936zOtuu_U
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Old 08-30-2015, 09:37 AM
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Seems normal to me.
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Old 08-30-2015, 05:31 PM
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Not sure what voltage you are supplying to it, but sometimes if you lower the voltage to the servo, it will quiet down. But it will also lower the performance. You might actually be supplying more voltage than your servo allows, not sure.
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Old 08-30-2015, 06:42 PM
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Hummm... I have tried several different digital servo's but none make that amount of noise while it is completely free (no horn attached).

When attached to the steering link, I notice noise as the servo continues to try to re-center (normal).

I suppose if your horn isn't visibly shaking it might be okay to use. I'd contact KO for comments though.
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Old 08-31-2015, 02:19 AM
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am using 2s lipo via esc with 6.0v bec.

i did post the question to america ko propo, still waiting for reply.
but did get a reply from an official taiwan distributor of ko propo saying it is normal.

without attaching any horn, it is hard to see but after attaching one, can see minute movement left and right about the center position.

guess it is normal after all.
thank all for the replies. first time using a digital servo.
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Old 09-01-2015, 03:03 PM
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Futaba, Spektrum, and Savox servos I have make no movement once centered though, especially while the servo is not connected to the chassis, or the wheels are off the ground.. Hope you get a reply from KO.
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