Introduction
Follow this guide to replace a faulty headphone jack in your Sandisk Sansa m230 Series MP3 Player.
Tools
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            Locate the interlocking pegs along the seam of the device's casings. 
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            Gently pry the pegs apart one at a time, working your way around the case. 
 
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            The battery contact springs may prevent the case from separating. 
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            Push the battery contact springs down through the hole in the case. 
 
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            The casing protecting the USB and headphone jacks must be removed. 
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            Locate and gently pry apart the two interlocking clips holding it in place. 
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            The outer casings may now be removed and the MP3 player should separate. 
 
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            Ensure the hot end of the soldering iron is elevated on a metal stand when not in use to prevent burns. 
 
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            Use the soldering iron and solder to create three stable connections between the motherboard and the headphone jack. 
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            Allow the new solder to cool and harden before reassembling the MP3 player. 
 
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To reassemble your device, follow these instructions in reverse order.