How to fix HP Color LaserJet Pro MFP M478fnw, Not print both sides

You are facing issues with duplex (two-sided) printing on the HP Color LaserJet Pro MFP M478fnw. This occurs even after selecting the option to print on both sides. Let’s work through a few troubleshooting steps to fix that. You can also check these tips. They explain how to copy on both sides of the HP Color LaserJet Pro MFP M283fdw. It is the type of HP Color LaserJet Pro, but a different model.

This is the step to fix the HP Color LaserJet Pro MFP. It addresses the issue of not printing on both sides. It may be able to help solve your problem. You can try first to see if you can fix it or not.

1. Check Duplexer Two-Sided Unit

(Automatic Two-Sided Printing Unit). The HP Color LaserJet Pro MFP M478fnw has a built-in duplexer for automatic two-sided printing. Sometimes, issues can occur if the duplexer is not functioning properly or has become disabled.

• Check for Paper Jams or Obstructions:
  Open the duplexer at the back of the printer. Ensure there are no paper jams. Also, check for any debris inside. If something is stuck, carefully remove it.
• Ensure Duplexer is Installed Properly:
  Ensure the duplexer is securely attached to the printer. If it’s loose or not seated properly, the printer won’t be able to print on both sides.

2. Verify Printer Settings Control Panel

Verify Printer Settings on the Printer’s Control Panel. You may have selected duplex printing from the computer, but let’s double-check the settings directly on the printer’s control panel.

• From the Home screen of the printer, tap the Setup icon (gear symbol).
• Navigate to Printing Setup or Print Settings.
• Find Duplex Printing and ensure it is set to Automatic.
• Make sure the Auto Duplex option is turned ON.

3. Verify Printer Driver Settings

Verify Printer Driver Settings on the Computer. Sometimes the duplex option doesn’t get passed to the printer correctly. Let’s check your print settings on your computer.

For Windows:

• Open the document you want to print.
• Click File > Print.
• Select the HP Color LaserJet Pro MFP M478fnw printer.
• Click on Printer Properties or Preferences.
• Under the Layout or Finishing tab, ensure Print on both sides or Duplex Printing is enabled.
• Click OK to save and then try printing again.

For Mac:

• Open the document you want to print.
• Go to File > Print.
• Under the Layout drop-down, ensure Two-Sided is checked.
• Select the appropriate binding option (usually Long Edge for portrait mode and Short Edge for landscape mode).
• Try printing again.

4. Check Paper Size & Orientation

The paper size and orientation need to be correctly set to allow duplex printing.

• Ensure the paper is loaded properly in the input tray. For instance, ensure that the stack of paper is not too high and that the paper is positioned correctly.
• Double-check the paper size being used (e.g., A4, Letter) to ensure it matches your print settings.

5. Update Printer Firmware

Firmware issues can sometimes interfere with duplex printing. Let’s make sure your printer’s firmware is up-to-date.

• Visit the HP Support website.
• Enter your printer model (HP Color LaserJet Pro MFP M478fnw) and look for the latest firmware version.
• If a new version is available, follow the instructions on the HP website to update the firmware.

6. Update Printer Drivers

Outdated drivers can cause issues with duplex printing.

• Visit the HP Support website and download the latest drivers for your model.
• Install the new drivers and restart your computer. Then, try printing again.

7. Check Printer Queue Stuck Jobs

Sometimes, a stuck print job can interfere with printing. Ensure there are no pending jobs in the print queue.

• Go to your Control Panel (Windows) or System Preferences (Mac).
• Open the Printers & Scanners section.
• Select your HP Color LaserJet Pro MFP M478fnw and open the Print Queue.
• Cancel any stuck or pending print jobs.
• Try printing your document again.

8. Manual Duplex Printing

We can do this for (as a Temporary Fix). If nothing else works, you can try manual duplex printing as a workaround:

• For Windows:
  • In the print dialog, select Print Odd Pages first.
  • After the odd pages are printed, flip the printed pages over and reinsert them into the paper tray.
  • Then, print the Even Pages.
• For Mac:
  • From the print dialog, select Odd Pages first. Then, flip the pages over and follow the same steps for printing the Even Pages.

9. Restart Printer and Computer

Sometimes a simple restart can clear out any issues.

• Turn off the printer, wait for about 30 seconds, and then turn it back on.
• Restart your computer as well to ensure any settings are refreshed.

These steps should help you resolve the issue with duplex printing on your HP Color LaserJet Pro MFP M478fnw. If it still doesn’t work after following these steps, there might be a hardware issue with the duplexer unit itself. In that case, you may need to contact HP support or a technician for further assistance.