Where can I locate troubleshooting materials for my printer?
Visit www.hp.com/support/ljE40040 or colorljE45028 for detailed guides on firmware updates, advanced configurations using the Embedded Web Server, and troubleshooting remote/mobile printing issues. Also use Help button on control panel as a direct lookup resource. (Page 7)
From the official HP Color Laserjet Managed E45028 manual, page 7
Have a follow-up question?
Answers from the official manual.
Common questions