HP Pro L7400 Troubleshooting tips and resources, Solve printing problems, Clean the exterior

Chapter 8

Clean the exterior

NOTE: Before cleaning the device, turn off the power and unplug the power cord from the electrical socket.

Use a soft, damp, lint-free cloth to wipe dust, smudges, and stains off of the case. The exterior of the device does not require cleaning. Keep fluids away from the interior of the device, as well as from the control panel.

Troubleshooting tips and resources

Use the following tips and resources to resolve printing problems.

•For a paper jam, see Clear a jam in the device.

•For paper-feed problems, such as the paper skew and paper pick, see Solve paper-feed problems.

•Verify that:

•The Power light is on and not blinking. When the device is turned on for the first time, it takes approximately 12 minutes to initialize it after the printheads are installed.

•No error messages appear on the computer screen.

•The power cord and other cables are working, and are firmly connected to the device. Make sure the device is connected firmly to a functioning alternating current (AC) power outlet, and is turned on. For voltage requirements, see Electrical specifications.

•Media is loaded correctly in the tray and is not jammed in the device.

•Printheads and ink cartridges are properly installed in their correct color-coded slots. Press down firmly on each one to ensure proper contact. Ensure you have removed the orange protective caps from each printhead.

•Printhead latch and all covers are closed.

•The rear access panel or optional duplexer is locked into place.

•All packing tapes and materials are removed.

•The device can print a self-test diagnostic page. For more information, see Understand the self-test diagnostic page.

•The device is set as the current or default printer. For Windows, set it as the default in the Printers folder. For the Mac OS, set it as the default in the Printer Setup Utility. See your computer's documentation for more information.

•Pause Printing is not selected if you are using a computer running Windows.

•You are not running too many programs when you are performing a task. Close programs that you are not using or restart the computer before attempting the task again.

Solve printing problems

•The device shuts down unexpectedly

•Error message appears on control-panel display

•The device is not responding (nothing prints)

•Device does not accept printhead

66 Maintain and troubleshoot