How to Solve Error 79 on HP LaserJet Printers

The Error 79 on HP LaserJet printers is a common issue that disrupts the printing process, leaving users frustrated. This error typically displays as 79 service error hp: Turn Off Then On,” and can occur due to various reasons, including firmware issues, hardware failures, or corrupt print jobs. Understanding the causes and implementing effective troubleshooting strategies can help resolve this error and prevent it from recurring.

This article provides an in-depth guide on how to solve Error 79 on HP LaserJet printers, from identifying the root cause to implementing long-term solutions.

What is Error 79 on HP LaserJet Printers?

Error 79 is a service error that usually indicates a problem with the printer’s firmware, hardware, or print job data. It causes the printer to stop functioning and display the error message on its control panel. While it may seem intimidating, the issue can often be resolved with simple troubleshooting steps.

Common Causes of Error 79

1. Firmware Issues

Outdated, corrupt, or improperly installed firmware can result in Error 79. Firmware acts as the printer’s internal software, controlling its operations, and any issues with it can disrupt the printer’s functionality.

2. Corrupt Print Jobs

Faulty or incompatible print jobs sent to the printer can overload its processing capabilities, leading to the error. These jobs often contain unsupported formats, embedded graphics, or corrupt data.

3. Network Communication Errors

For network-connected printers, communication failures or incorrect network configurations can trigger the error. This is especially common in environments with multiple devices sending print requests simultaneously.

4. Third-Party Accessories

Non-certified toner cartridges, memory upgrades, or other hardware add-ons may not be fully compatible with the printer, causing it to malfunction.

5. Hardware Malfunctions

Internal hardware issues, such as problems with the formatter board or memory modules, can also lead to Error 79.

Step-by-Step Guide to Solve Error 79

Step 1: Restart the Printer

The simplest and often most effective solution is to restart the printer.

Steps to Restart:

1. Turn off the printer using the power button.
2. Wait for 30 seconds to 1 minute.
3. Turn the printer back on and check if the error persists.

Restarting clears temporary memory and resets the printer’s internal system.

Step 2: Disconnect the Printer from the Network

If the printer is connected to a network, disconnect it by removing the Ethernet cable or disabling Wi-Fi. This isolates the printer from network-related issues and prevents corrupt print jobs from being sent.

Step 3: Clear the Print Queue

Clearing the print queue ensures no corrupt or incompatible print jobs are causing the error.

How to Clear the Print Queue (Windows):

1. Open Control Panel and navigate to Devices and Printers.
2. Right-click on your printer and select See what’s printing.
3. Cancel all pending print jobs.

How to Clear the Print Queue (Mac):

1. Go to System Preferences > Printers & Scanners.
2. Select your printer and click Open Print Queue.
3. Cancel any jobs listed in the queue.

Step 4: Update the Printer’s Firmware

Outdated firmware is a common cause of Error 79. Updating it ensures the printer has the latest software fixes and compatibility improvements.

How to Update Firmware:

1. Visit the HP Support Website.
2. Enter your printer model and download the latest firmware version.
3. Follow the installation instructions provided.
4. Restart the printer after updating.

Step 5: Remove Third-Party Accessories

If the printer uses third-party toner cartridges, memory modules, or other add-ons, replace them with genuine HP components.

• Non-certified accessories may not be fully compatible with HP LaserJet printers, causing errors or malfunctions.

Step 6: Perform a Factory Reset

Restoring the printer to its factory default settings can resolve persistent configuration issues.

Steps to Perform a Factory Reset:

1. Access the printer’s control panel.
2. Navigate to Settings > System Setup > Restore Defaults.
3. Confirm the reset and wait for the printer to restart.

Step 7: Check for Hardware Issues

If none of the above steps resolve the issue, it may be due to a hardware malfunction. Components like the formatter board or logic circuits may need repair or replacement.

• What to do: Contact HP Customer Support or a certified technician to diagnose and fix the hardware problem.

Preventing Error 79 in the Future

Prevention is better than cure. Implement the following practices to reduce the likelihood of encountering Error 79:

1. Regular Firmware Updates

• Ensure the printer’s firmware is always up-to-date.
• Enable automatic updates if your printer supports this feature.

2. Use Certified Accessories

• Always use genuine HP toner cartridges, memory modules, and other accessories.
• Avoid third-party components, as they may not be compatible with your printer.

3. Monitor Print Jobs

• Check for unsupported formats or corrupt data before sending print jobs to the printer.
• Avoid sending overly complex files, such as large PDFs with embedded graphics.

4. Maintain Network Stability

• Assign a static IP address to the printer to avoid conflicts.
• Regularly check the network configuration to ensure stable communication between devices.

5. Schedule Periodic Maintenance

• Perform regular maintenance checks on the printer, including cleaning and inspecting internal components.
• Follow the manufacturer’s recommended servicing schedule.