Introduction
This guide will require you to disassemble the rear and side panels of the printer in order to access the circuit board.
Tools
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            Remove the front panel by gently freeing the holes on the panel from the pegs attached to the main printer body one at a time. Make sure to remove the entire front panel, not just the flap on the paper tray. 
 
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            Using a plastic opening tool, gently lift one side of the top panel from its peg. 
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            Repeat the process for the other side. 
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            Lift the top panel from the front to remove it entirely. 
 
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            Lift the right panel up from the raised stops. 
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            Rotate the panel gently as indicated in the picture to remove the panel entirely. 
 
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            Using a Phillips #2 screwdriver, remove the four 1" screws attaching the gray plate to the printer. 
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            Remove the plastic cover by sliding it carefully under the silver hinges on the right. 
 
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            Using a Phillips #2 screwdriver, remove the 1" screw attaching the circuit board to the printer. 
 
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            Turn over the circuit board to access main wiring. 
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            Unplug the wiring from the circuit board gently. 
 
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To reassemble your device, follow these instructions in reverse order.