Serial Number Location
![toner serial number location](ink-serial-number-location-new.png)
Toner Cartridge Serial Numbers
Toner cartridge serial numbers are 12 digit numbers and start with the letters CA. The (S) on the label identifies the serial number, the (P) printed on the label signifies the part number. Only serial numbers can be authenticated. The serial number can be found on the outer box and on the toner cartridge.
![ink serial number location](ink-serial-number-location-new2.png)
Ink Cartridge Serial Numbers
The ink cartridge serial number to be entered is a 7 or 10 digit number. Serial numbers can be found on the outer box, foil bag and ink tank.