The serial number is located on the UPC sticker inside the ink cartridge door.
To view the UPC sticker, open the ink cartridge door (on the front, top-left side of the printer). The sticker is located in the bottom-left corner on the inside of the door (as pictured below).
Figure : UPC sticker location
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UPC sticker located on the bottom-left corner inside the ink cartridge door
The serial number (Serial No.) is located on the label below the barcode and above the FPU No. (as pictured below).
Figure : Close-up view of a Serial No. on a UPC sticker
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Serial No on UPC sticker