Introduction
Are the buttons not working on your printer? Consider using this guide to replace the buttons in your device.
Tools
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            Insert 2 fingers in the dent on the right side of the printer and pull towards the front of the printer. 
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            Using fingers to open the cover of the scanner which located on the top of the printer. 
 
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            Remove four 10mm screws on the panel with T8 torx security screwdriver. 
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            Remove the cover of the top part. 
 
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            Remove eight 10mm screws on the back of the controlling keyboard with T8 torx security screwdriver. 
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            Remove the back board of the controlling keyboard. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.