HP LaserJet Pro CP1525nw Color Printer - Manual (Page 117)

7. Do not touch the imaging drum on the bottom
of the print cartridge. Fingerprints on the
imaging drum can cause print-quality
problems.
8. Insert the new print cartridge into the product.
9. Pull the tab on the left side of the print cartridge
straight up to completely remove the sealing
tape. Discard the sealing tape.
ENWW Manage supplies and accessories 103