HP LaserJet 4000 and 4050 series service mode

1. Hold down [Select] and [Cancel Job] while turning on the printer until all of the lights on the Control Panel are lit. (If the Control Panel reads INITIALIZING, the keys were released too soon.)

Step 2. Next>>>

2. Press the right side of the [Menu] key, then press [Select]. The message SERVICE MODE is displayed.

3. Press [Menus] once to display SERVICE MENU.

4. Once it says SERVICE MENU press ITEM to scroll through service mode items.

5. To exit the Service Mode press [Go].