HP Printer Error Code 77: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
77
Brand
HP
Product Type
printer
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
HP Printer Error Code 77 indicates a copy processor error, meaning the printer's internal firmware or processing unit has encountered a problem it cannot resolve on its own. This typically occurs due to corrupted firmware, a failed internal memory component, or a software conflict that disrupts the printer's ability to manage copy jobs. In most cases, this error can be resolved through software-level fixes like firmware updates or factory resets before any hardware replacement is considered.
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Tools You'll Need

How to Fix Error Code 77

  1. Power Cycle the Printer

    Always unplug from the wall outlet to fully discharge the printer's capacitors. Do not simply press the power button off and back on — a full power cycle is required.

  2. Check and Update Printer Firmware

    Never turn off the printer or disconnect it from power during a firmware update. Interrupting the update can permanently damage the printer's firmware and may require professional service to recover.

  3. Perform a Printer Self-Test and Diagnostic Print

  4. Clear the Print Queue and Restart the Print Spooler

  5. Reinstall the HP Printer Drivers

  6. Restore the Printer to Factory Default Settings

    A factory reset will erase all custom settings including Wi-Fi credentials and any stored configurations. Make a note of your network settings before proceeding.

  7. Inspect and Reseat Internal Memory Modules (Advanced)

    Unplug the printer and allow it to sit for 2 minutes before opening any panels. Static electricity can damage internal components — touch a grounded metal surface before handling memory modules. Only attempt this step if your printer model explicitly supports user-accessible memory and you are comfortable with basic hardware handling.

Parts You May Need

Printer memory module (RAM DIMM)
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Formatter board
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Printer memory module (RAM DIMM)
Check Price on Amazon
Formatter board
Check Price on Amazon
Printer memory module (RAM DIMM)
Check Price on Amazon
Formatter board
Check Price on Amazon
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When to Call a Professional

If you have completed all steps — including the firmware update, factory reset, driver reinstall, and memory reseating — and Error Code 77 still appears, the copy processor board or formatter board inside the printer may have failed. These components are not user-serviceable on most HP printer models and require a certified HP technician or authorized repair center. Additionally, if your printer is still under HP's warranty, do not attempt to open internal panels as this may void your coverage. Contact HP Support directly or visit an authorized service provider for diagnosis and repair or replacement.

Frequently Asked Questions

What does Error Code 77 mean on an HP printer?
HP Printer Error Code 77 is a copy processor error. It means the printer's internal processing system has encountered a fault while trying to handle a copy or print job. This is often caused by corrupted firmware, a software conflict, a clogged print queue, or in less common cases, a failing internal hardware component such as a memory module or formatter board.
Can I fix HP Error Code 77 myself without calling a technician?
Yes, in most cases you can fix Error Code 77 yourself. Start with a full power cycle, then update your printer's firmware from HP's support website, reinstall the printer drivers, and if needed, restore the printer to factory defaults. Most users resolve this error through one of these software-level steps without needing professional service.
Will a factory reset fix HP Error Code 77?
A factory reset can fix Error Code 77 if the issue is caused by corrupted settings, firmware glitches, or internal configuration conflicts. However, keep in mind that a factory reset will erase all saved settings including Wi-Fi passwords and custom preferences. If the error returns after a factory reset, the problem is likely hardware-related and a technician should be consulted.
How do I update the firmware on my HP printer to fix Error 77?
Go to support.hp.com and enter your printer's model number. Navigate to the 'Software and Drivers' tab and look for a firmware update. Download the firmware installer and run it on your connected computer, or some HP models allow direct firmware updates via the printer's control panel under Setup > Printer Maintenance > Update Firmware. Make sure the printer stays powered on and connected throughout the entire update process.
Why does HP Error Code 77 keep coming back after I restart the printer?
If Error Code 77 returns every time you restart your printer, a simple power cycle is not enough to resolve the underlying issue. This suggests a more persistent cause such as outdated firmware, a corrupted driver, a stuck print job in the spooler, or a failing internal hardware component. Work through the full troubleshooting steps — particularly the firmware update and factory reset — to address the root cause. If the error keeps returning after all software fixes, a hardware component like the formatter board may need professional replacement.

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