@Jrf76, Welcome to HP Support Community.
Thank you for posting your query, I will be glad to help you.
If your HP Smart Tank 750 isn’t printing yellow even though the ink level looks fine (over 50%), the issue could be a clogged printhead, air bubbles, or ink flow problems. Here’s a simple checklist you can try:
Printhead Cleaning
- On the printer control panel or through the HP Smart app:
- Go to Settings > Printer Maintenance > Clean Printhead.
- After cleaning, print a test page.
- If yellow is still missing, you may need to run the cleaning 2–3 times.
Nozzle Check
- In HP Smart, choose to print a Print Quality Diagnostic Page.
- Check if the yellow test pattern is missing or broken.
Check Ink Flow
- Open the printer lid.
- Look at the ink tubes (they're visible inside). Ensure the yellow line isn’t filled with air gaps or bubbles.
- If you see bubbles or empty spots, you might need to run a "prime" or "deep clean" from the maintenance menu.
Manual Printhead Cleaning (if needed)
If automatic cleaning doesn’t fix it, a manual cleaning might help:
- Power off the printer.
- Open the access area and carefully remove the printhead (follow the printer guide/manual for your model).
- Dab the bottom of the printhead with a lint-free cloth lightly moistened with distilled water (NOT tap water).
- Let it dry and reinstall.
Ink Cartridge Check
Even if the tank looks full, sometimes the ink doesn’t properly flow to the printhead:
- Make sure the yellow ink lid is tightly closed and that the yellow tank is not clogged at the outlet.
- Gently tap the tank area to encourage ink flow.
I hope this helps.
Take care and have a good day.
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Max3Aj
HP Support