Replaced printhead but now can't get printer to print. I get a very faint copy you can't read

[samsas1]

I have HP Office Jet Pro 8620. We put in a new printhead.  However, it won't print....just a very very faint copy.  All the inks are filled.  Why can't I print in black and white or color?   Thank you

[Max3Aj]

@samsas1, Welcome to HP Support Community. 

Thank you for posting your query, I will be glad to help you. 
If you've recently replaced the printhead on your HP OfficeJet Pro 8620 and are now experiencing very faint or unreadable prints, here's a comprehensive troubleshooting guide to help resolve the issue:

🔧 Step-by-Step Troubleshooting:

✅ 1. Run the Printhead Cleaning Utility

Even with a new printhead, you may need to prime the ink flow:

• Go to the printer's control panel.
• Tap Setup > Printer Maintenance > Clean Printhead.
• Run this 2-3 times for proper ink flow.

💡 Caution: Stop after 3 cleanings to avoid wasting ink if no improvement is seen.

✅ 2. Check Ventilation on Ink Cartridges

Ensure ink can flow properly:

• Remove each cartridge.
• Examine the small vent hole on top (near the HP logo).
• Gently clean any blocked vents with a pin or soft cloth.

✅ 3. Use the Print Quality Diagnostic Tool

• From the printer's touchscreen:
  • Navigate to Setup > Reports > Print Quality Report.
• Analyze if black and colors are printing at all.

If some colors are missing or faded, it may indicate a clog or connection issue.

✅ 4. Verify Ink Flow to the New Printhead

• Open the printer lid with power on to move the carriage to the center.
• Firmly press each cartridge to ensure it's fully clicked in.
• Check for ink visibility on the printhead nozzles (gently blot with a paper towel).

✅ 5. Align the Printhead

• On the printer screen:
  • Go to Setup > Printer Maintenance > Align Printer.
• Proper alignment is crucial for print quality.

✅ 6. Check Firmware and Software

• Ensure the printer has the latest firmware.
• Update the printer driver on your computer (especially for USB or Wi-Fi printing).

I hope this helps. 

Take care and have a good day. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping! 

Max3Aj

HP Support