Introduction
If you are looking to replace or just clean the dust filter, this guide is for that. You'll need an opening tool such as a plastic or metal spudger. The steps are straightforward and don't involve anything overtly complicated, but be sure to be careful to avoid damage to the rivets.
Tools
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Wedge a spudger into the half-circle idnent and pry the panel off until it partially pops open.
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Go around the perimeter of the panel with the spudger to pry it the rest of the way off.
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The panel you've just removed has a foam dust filter in it. It is not attached to the panel, so just remove it by hand.
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Conclusion
To reassemble your device, follow these instructions in reverse order.