Digital Servo only rotating 90 Degrees?

Hey everyone, new to the forum.

I have an HK15298 servo from here

http://www.hobbyking.com/hobbyking/store/__16271__HK15298_High_Voltage_Coreless_Digital_MG_BB_Servo_66g_15kg_0_11s.html

I used the arduino sweep servo code to rotate 180 degrees, but it only rotates 90 degrees. I can manually rotate the servo a full 180 degrees by hand.

What is the problem here?

:(

Servos are normally expected to rotate 90 deg for RC applications. 180 deg rotation is a bonus. Some digital servos can be reprogrammed to rotate 180 deg, but you may need to buy a programmer.