Introduction
If you're encountering issues as a result from the scanner bed, this is where you will want to start.
To replace the glass scanner bed, you must:
- Remove the two plastic bars that holds the scanner bed in place.
- Carefully remove the glass scanner bed to add the replacement.
Tools
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            Turn your device so that you're facing the long side of the Canon CanoScan N670U. 
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            Locate the small crevice between the plastic components of the scanner bed and the scanner base. 
 
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            Carefully insert a metal spudger tool in the crevice and slowly cut through the adhesive between the plastic components. 
 
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            Once the adhesive strip is sliced through, the plastic bar that is attached should release. Set aside the plastic bar. 
 
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            Use your hands or a metal spudger tool to push the plastic bar at the bottom of the glass scanner bed forward until you can't push it any farther. 
 
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            Insert the metal spudger tool underneath the glass scanner bed. The front of the scanner bed should be resting on top of the tool. 
 
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To reassemble your device, follow these instructions in reverse order.