For: HP LaserJet P1505/P1505N/M1120/M1120N/M1522N/M1522NF 

 Should use this user should be a lot of attention to usual maintenance cartridge. 

 1) Do not drum exposed to direct sunlight or other strong light source below. 

 2) Do not replace the cartridge in the bright light should be as soon as possible to complete the installation process. 

 3) When remove the cartridge from the printer, immediately put it back on the box or lint with a thicker wrap. 

 4) If the cartridge from a cold place, then move to a warm place and set it aside for an hour or more before use. 

 5) The cartridge light barrier shielding the external light source, to protect the photosensitive drum, do not open the cartridge light barrier. 

 6) Do not touch the surface of photosensitive drum, to prevent the drum surface is scratch hard objects. 

 7) Do not place the drum in the high temperature and high humidity. 

 8) ensure that toner away from the monitor, hard drive, floppy drive or any other magnetic material