HP LaserJet Pro M501, M506, MFP M527, HP LaserJet Managed E50045, E52545 - Removal and replacement: Multipurpose tray (Tray 1) pickup roller and separation pad | HP® Customer Support
Amazon.com: HP LaserJet Pro M501dn Monochrome Printer with built-in Ethernet & 2-sided printing (J8H61A) : Electronics
Replace the Toner Cartridge | HP LaserJet Pro M501, Enterprise M50x, MFP/Flow M52x, E50145, E52645 - YouTube
HP LaserJet Pro M501dn
Amazon.com: HP LaserJet Pro M501dn Monochrome Printer with built-in Ethernet & 2-sided printing (J8H61A) : Electronics