Introduction
If the buttons on the device do not work, refer to this guide. Please see the Sony Dream Machine ICF-C717PJ Troubleshooting page: Sony Dream Machine ICF-C717PJ to eliminate other possible issues before tinkering with the buttons. This guide will help you fix the buttons on the Sony Dream Machine ICF-C717PJ.
Tools
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            Gently insert a flat head screwdriver in the gaps between the button and device body to loosen them from their positions. 
 
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            Insert the new button from the inside of the device, pushing it gently towards the front until it locks into place. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.