HP LaserJet Pro M203dn

The printer includes diagnostic tests for the LED, LCD, and touchscreen control panels.

1. Open the secondary service menu.
   
   LED control panels
   NOTE: HP Device Toolbox is software used to connect to the HP Embedded Web Server when the printer is connected to a computer via USB. It is available only if a full installation was performed when the printer was installed on a computer. Depending on how the printer is connected, some features might not be available. The HP Embedded Web Server is not accessible beyond the network firewall.
   a. Open the HP Printer Assistant.
   • Windows 8.1: Click the down arrow in lower left corner of the Start screen, and then select the printer name.
   • Windows 8: Right-click an empty area on the Start screen, click All Apps on the app bar, and then select the printer name.
   • Windows 7, Windows Vista, and Windows XP: From the computer desktop, click Start, select All Programs, click HP, click the folder for the printer, select the icon with the printer's name, and then open HP Printer Assistant.
   b. In the HP Printer Assistant, select Print, and then select HP Device Toolbox.
   
   2-line control panels
   a. From the printer control panel, press the Setup button.
   b. Simultaneously press the Resume/Cancel button and the left arrow button. The 2ndary Service menu item should be at the top of the list.
   c. Use the left and right arrow buttons to navigate through the menu. When finished, press the Resume/Cancel button to close the menu.
   
   Touchscreen control panel
   a. From the Home screen on the printer control panel, touch the Setup ⚙ button.
   b. Touch the space between the Home ⌂ and the Help ❔ button.
   c. Touch the Back ⮌ button.
   d. Touch the Setup ⚙ button.
   e. Touch 2ndary Service (at the top of the list) to access the menu.
2. Select one of the following tests:
   NOTE: Not all tests are available for all control panels.
   • LED test: Test the LED lights. The touchscreen control panels do not have any LEDs.
   • Display Test: Test the control panel display.
   • Button Test: Test the control panel buttons.