HP LaserJet 9040.9050 Multifunction Printer series - Manual (Page 216)

212 Appendix B Control panel menus ENWW
Service menu
The Service menu is locked. A service technician must type a PIN to open the menu.
CONTROL PANEL LEDs
DISPLAY
BUTTONS
TOUCHSCREEN This menu item is used by a service technician
to diagnose potential printer problems.
Item Options Values Explanation