cannot print color with A3 format with my 7720

[Andrea413]

When I print A4 format everything works perfect.

When I print A3 format in color the print is blurred and it only prints in grayscale. 

firmware updated to the last version (hp firmware not windows one)

remove and install doesn't fix the problem.

What can i do?

[Valsimot]

That is because you are using Microsoft drivers, you need to download and install drivers from hp.com

[Andrea413]

As i wrote in the post, i’m using hp drivers and not windows one. 

[D Hook]

Your first post indicates you've updated the firmware.  Different than the driver.

You need to download and install the HP DRIVER.

[Andrea413]

Ok my fault, i’m using last firmware update and last hp driver update.

the problem seems to be only for pdf document. I can print images and text with color

[Valsimot]

What is your current driver version installed?

Don't use driver update it will only instal Microsoft drivers, use drivers from hp.com