Introduction
The scroll wheels allows user interact with the device. A scroll wheel that does not work will not allow users to play music or access other features on the device.
Tools
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            From the back of the device, slide the back panel downwards to unlock the panel. 
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            Lift the panel up, exposing the battery. 
 
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            Start by using a plastic opening tool to loosen the front cover from the sides. 
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            Work your way to the bottom of the cover then the top. 
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            Carefully pry the front cover off. 
 
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            Isolate the scroll wheel assembly 
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            Gently pry the four metal tabs outwards, away from the scroll pad. 
 
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            Once the scroll pad has been released, be careful not to drop the center button. This may damage the spring. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.