HP LaserJet Pro 300 Color MFP M375 - Manual (Page 110)

6. Remove the orange, plastic shield from the
bottom of the new print cartridge.
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.
94 Chapter 7 Print cartridges ENWW