Need Help HP FB750 not printing any black

[Andrew Hodgson]

Hi, my HP FB750 printer has mostly not been used for the past year and now will not print black ink at all.

What I did during the past year
- Clean the print heads, about every ~4 weeks due to COVID.
- Kept the printer on
- Made sure there was ink for each color

What I tried
- Check jet health and the black portion is completely blank
- Air purge a couple of times and fill the line with ink
- Use a different ink box but both black ink boxes warranty is about to expire.
- Did most of the cleaning maintenance before printing

During the year, the print room did get pretty cold. I do not think the print carriage has hit anything while printing with it. The printer is out of warranty and I started a ticket with HP but right now they're just sending a new ink box.

Anything else I may be able to do besides ordering a new printhead or having someone come out to fix the printer?

 

[Boudica]

HP has had a (many) run of bad "under performing" ink - particularly the black. You may have some bad ink. I would give the new ink a try before replacing a head.

 

[JAMES RIANI]

Most probably a bad box of ink. It's a huge problem lately. I've had 3 replaced. You'll have to empty and refill the head 3-4 times.

 

[Andrew Hodgson]

If anyone finds this post, the black ink was the problem. I refilled the line with new black ink 3 times and was able to get a fine prime bar test.