HP Color LaserJet Enterprise M552

Use the diagnostics in this section to test the control-panel hardware and embedded firmware. These tests are useful for checking control-panel functionality independent of the printer control-panel system diagnostics. To test the control panel using the system diagnostics.

1. Locate the diagnostic-tests access button on the back of the control panel.
2. Press the diagnostics-access button. Repeatedly pressing the button cycles through the available diagnostics.
   NOTE: A pen, pencil, or other small blunt object is needed to press the button.
   TIP: When pressed, the button illuminates green.
3. A yellow screen appears (after the first press of the button) indicating that the control-panel firmware is
   version A (a magenta screen indicates version B firmware).
   NOTE: If a different color appears on the screen, contact your global business unit (GBU) to determine
   the firmware version.
   TIP: After 4 seconds of inactivity, the diagnostic mode times out and is exited.
4. Touch the screen to cycle the screen through the following:
   A red screen, a green screen, and a blue screen.
   Five brightness levels of a white screen.
   A final black screen.
   TIP: When the final black screen displays, press the Home button to cycle through the diagnostic
   screens and test its functionality.
5. Pressing the diagnostic-tests button with the black screen displayed, exits the diagnostic mode.