HP LASERJET-M140WE-MFP user manual

The blinking exclamation mark on your HP LaserJet M140we MFP indicates that there is an issue or error that requires your attention. It could be caused by various reasons, such as a paper jam, low toner level, a door not properly closed, or a hardware malfunction.
To identify the specific issue, you can check the printer's LCD display or control panel for any error messages or codes. Once you determine the cause of the error, take appropriate actions to resolve it. For example, if there is a paper jam, open the printer and remove the jammed paper. If the toner is low, replace the toner cartridge. If the issue persists or you are unable to identify the problem, consult the printer's user manual or contact HP customer support for further assistance.

There could be a few reasons why your HP printer is not printing on both sides automatically:
1. Duplex Printing Disabled: Check if the duplex printing option is enabled in the printer settings. Open the printer properties on your computer and make sure the "Print on both sides" or "Duplex printing" option is selected.
2. Incorrect Paper Size or Type: Ensure that the paper size and type selected in the printer settings matches the actual paper loaded in the printer. If there is a mismatch, the printer may not be able to print on both sides automatically.
3. Outdated Printer Drivers: Make sure you have the latest printer drivers installed on your computer. Outdated drivers can cause compatibility issues and prevent automatic duplex printing.
4. Hardware Limitations: Some HP printers may not have the built-in capability to print on both sides automatically. Check the specifications of your printer model to determine if it supports automatic duplex printing.
5. Environmental Settings: Some printers may have environmental settings that need to be properly configured for duplex printing. Refer to your printer's user manual or contact HP support for specific instructions.
If none of these solutions work, it is recommended to contact HP customer support for further assistance.

To troubleshoot an HP LaserJet printer, you can follow these steps:
1. Check the connections: Ensure that the printer is properly connected to the power source and to your computer or network. Verify that the cables are secure and undamaged.
2. Restart the printer: Turn off the printer, unplug it from the power source, wait for a few seconds, then plug it back in and turn it on. This simple step can often resolve minor issues.
3. Check for error messages: If the printer displays an error message, make a note of it. Use the user manual or HP's support website to find the meaning of the error code or message and follow the suggested troubleshooting steps.
4. Update printer drivers: Outdated or incompatible printer drivers can cause issues. Visit HP's support website, enter your printer model, and download and install the latest drivers for your specific operating system.
5. Clear print queue: Sometimes, a jammed print queue can cause print jobs to get stuck. Open the print queue on your computer, cancel any pending print jobs, and then try to print again.
6. Run the printer's internal diagnostic tool: Most HP printers have a built-in diagnostic tool that can identify and fix common issues. Consult your printer's user manual or the manufacturer's website to learn how to access and run the diagnostic tool.
7. Check ink or toner levels: If your printed documents are faint or faded, it may be time to check the ink or toner levels. Replace any cartridges that are low or empty.
8. Clean the printer: Dust, debris, or paper remnants can lead to print quality issues or paper jams. Follow the instructions in the user manual to clean the printer's rollers, print heads, and any other accessible components.
9. Reset the printer: In some cases, resetting the printer to its factory default settings can resolve persistent issues. Refer to the user manual or manufacturer's website to find the specific reset instructions for your printer model.
10. Contact HP support: If all else fails, you can reach out to the HP customer support team either through their website or by phone. They can provide further assistance and help resolve any complex printer issues.
Remember to refer to the user manual or HP's support website for detailed information specific to your printer model.