HP CM1312 MFP Series - Manual (Page 188)

Replace supplies
Print cartridge
1 Cartridge E-label
2 Plastic shield
3 Imaging Drum. Do not touch the imaging drum on the bottom of the print cartridge. Fingerprints on the imaging drum can
cause print-quality problems.
1. Open the front door.
176 Chapter 14 Manage and maintain the product ENWW