78
HP Printer
Severity:What Does This Error Mean?
Error 78 is a configuration storage error on HP LaserJet printers. The printer's NVRAM (the chip that stores settings) has detected a conflict or corrupt configuration data. This usually appears after a firmware update, a reset, or when an incompatible accessory is installed.
Affected Models
- HP LaserJet 4000 Series
- HP LaserJet 4050 Series
- HP LaserJet 4100 Series
- HP LaserJet 5000 Series
- HP LaserJet Enterprise 600 Series
Common Causes
- A firmware update was interrupted or completed incorrectly, leaving corrupt configuration data
- The NVRAM chip that stores printer settings is failing
- An incompatible accessory is creating a configuration conflict
- A factory reset was performed but certain settings could not be cleared properly
- Power was lost during a settings save operation, corrupting the stored configuration
How to Fix It
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Perform a cold reset on the printer to clear all stored configuration data. Refer to your printer's manual for the exact key sequence.
A cold reset erases all custom settings. Write down your network settings, paper sizes, and preferences before you reset.
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After the reset, do not change any settings. Power cycle the printer and check if the error is gone.
Sometimes the error clears on its own after a full reset and fresh startup. Check the printer's status page before reconfiguring.
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If the error clears, reconfigure the printer settings one at a time. Restart after each change to identify if a specific setting triggers the error.
This methodical approach helps identify if a particular configuration combination is causing the conflict.
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Download and reinstall the latest firmware from HP's official support website using a USB connection.
A clean firmware reinstall can overwrite corrupted configuration code that survives a manual reset.
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Remove any optional accessories — extra trays, EIO cards, or other add-ons. Check if the error appears on the base printer alone.
An incompatible accessory can create configuration conflicts that appear as error 78. Removing it isolates the problem.
When to Call a Professional
If the error returns after every reset or firmware update, the NVRAM chip may need replacement. This is a soldering-level repair on the formatter board and requires a skilled technician. On many older printers, it may be more cost-effective to replace the printer entirely.
Frequently Asked Questions
What is NVRAM in a printer?
NVRAM stands for Non-Volatile Random Access Memory. It is a special chip that retains stored information even when the printer is turned off — similar to the BIOS chip in a computer. Your printer stores settings like paper size, print quality preferences, and network configuration in NVRAM.
Will a cold reset delete everything on my printer?
Yes. A cold reset wipes all custom settings back to factory defaults. This includes network settings, paper size preferences, and any stored jobs. Make sure to write down important settings before you perform the reset.
Is error 78 common after a firmware update?
Yes — error 78 sometimes appears right after a firmware update, especially if the update did not complete cleanly. In most cases, a simple cold reset followed by a firmware reinstall clears it. If you see error 78 every time you update the firmware, contact HP support — there may be a known issue with your specific model.