Servo 打冷震！救命！

各位師兄，我剛買左M12同sanwa SRG BLS servo !
但係個servo著車著控就打冷震，係咪個servo有問題？定係支槍有問題？心情極度低落.......請各師兄指點迷津！

呢隻servo係咁,不停搵中位,正常的!!

From sanwa:

About the digital servos specification

Model: All "SANWA" brand digital servos.
SANWA's digital servos were designed to improve a vehicle resoponse to the limit. As a result, the servos makes frizzling noise on neutral status and also the servo horn vibrates slightly. These symptoms are caused by the strict specification, however it does not affect product's performance. We would recommend you to feel the deffirence of the vehicle response.

唔該曬師兄！感謝！

換句話說，吱吱聲係正常？我隻ERS962又係咁。