This comprehensive service manual provides detailed information and troubleshooting guidance for the HP Color LaserJet Enterprise M651n, M651dn, M651xh, and M680dn, M680f, M680z models. It serves as your ultimate resource for diagnosing and repairing these printers, offering in-depth coverage of various aspects, including hardware, print quality, control panel navigation, troubleshooting guides, and advanced features.

The manual provides detailed descriptions of each component, including the 2,500-sheet high-capacity feeder (HCI) and 3-bin stapling mailbox accessory (M680). Learn how to troubleshoot print quality issues, interpret error messages, and perform cleaning and calibration procedures. Navigate the control panel menus with ease, understanding all the settings and options available. Solve common problems including paper jams, connectivity issues, performance problems, and image quality defects.

Access the service menu, perform resets, and utilize advanced functionality. Troubleshoot fax problems on the M680 model, including sending, receiving, and general fax setup. Learn how to update firmware using the HP Embedded Web Server or a USB flash drive. Get quick access to product specifications, a comprehensive index for easy navigation, and additional helpful information.