z3100 blacks "blotchy"

[Wayne Fox]

After installing the new firmware, recalibrating to the paper, and creating a new profile, my solid blacks now are not "solid" and clean.

It is very subtle.  I really can't see it anywhere except in the blacks of a graduated panel.  I don't know if I have a head clog, or what to look at.

[Geoff Wittig]

Try printing the test page from the printer's front panel. This will tell you immediately if you have any head clogs.
I've been printing some glossy black & white images with the new firmware installed, and the blacks are smooth as butter.