Blurry prints - but only from Mac and iPhone

[claub]

My deskjet 2540 prints beautiful test pages.
The prints made from a Windows PC are beautiful.

But anything printed from one of our Mac computers or iPhones via Airprint is awful with blurred lines.
I have updated to the latest printer software from HP. 
Using only original HP cartridges.

Using Catalina 10.15.3

What can I do to fix the problem?

[TEJ1602]

@claub, Welcome to HP Support Community!

This could be an issue with the print driver settings or the installed drivers itself. Let us try to isolate and resolve the issue-

Check the settings before you send the print job. Refer to the document HP Printers - Print Settings Guide (Mac) for help.

ensure that the printer is up to date with its firmware and Mac is up to date with its software. If you are unsure you may use the links below to update the printer firmware and Mac software:

Update printer firmware

Update software on Mac 

Remove and add the printer

Click the Apple menu, and then select System Preferences.

Depending on your operating system version, click Print & Fax, Print & Scan, or Printers & Scanners.

Click the name of your printer, click the Minus sign, and then delete the printer.

Click the Plus sign, and then click Add Printer or Scanner.

Click the Use or Print Using box, and then select AirPrint

Click Add to add the printer to the list.

Try to print.

Keep me posted for further assistance.

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