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If you're having issues as a result of a dirty or faulty white document mat, this is where you will want to begin.
To remove the white document mat, you must:
- Carefully rip out the foam that's glued onto the cover.
- Glue in the replacement document mat.
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            Open up the top of your Canon CanoScan N670U to this position. 
 
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            The document mat is taped on to these four corners of the cover. These spots will be where we'll start removing the mat. 
 
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            Gently peel the tape on each corner of the mat using your hands or an iFixit Tech Knife. 
 
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            Tape in your replacement document mat back onto the top cover of the scanner. 
 
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To reassemble your device, ensure that the white document mat is firmly glued on.
To reassemble your device, ensure that the white document mat is firmly glued on.
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