HP LaserJet Pro 400 color Printer M451 series - Manual (Page 101)

Once an HP supply has reached very low, HP's premium Protection Warranty on that supply has
ended. All print defects or cartridge failures incurred when an HP supply is used in continue at very
low mode will not be considered to be defects in materials or workmanship in the supply under the HP
Print Cartridge Warranty Statement.
ENWW Solve problems with supplies 83