If you have a multimeter, you can use it to check the resistance of the solenoids inside the servo to make sure they're operating properly. The following procedure will work on most C4 servos. The connector will be labeled A, B, C, D, E. Unplug the connector; remember, you'll need to refer to the correct alphabetical locations at the servo.
1. Check the resistance between pins A and C. It should be somewhere between 30 and 50 ohms.
2. Check the resistance between pins C and E. It should be somewhere between 30 and 50 ohms.
3. Check the resistance between pins B and D. It should be somewhere between 10 and 30 ohms.
If any of the resistance readings falls out of range, a defective solenoid is likely to blame and the unit should be replaced. View Related Article
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