A guy, a few hundred miles away, approached me with this problem on a Z3100:
"There are no error codes displayed. It just doesn't recognize...
2 results in 0.0410 seconds.
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Z3100 keeps feeding sheet fed media out of printer
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Learned my lesson, but, thanks anyway HP!
Just spent a bunch of hours troubleshooting a printhead (MK/R) rejection issue on a Z3200. I eventually found (after the customer ordered new MK/R printheads)...
