HP AFICIO SP 8100DN - Manual (Page 119)

Troubleshooting
108
8
If the problem cannot be solved, contact your sales or service representative.
The paper size appears on the
control panel and printing is not
performed with PDF Direct
Print. When using PDF Direct Print, printout requires paper set
within the PDF file. When a message indicating a paper size
appears, either place the indicated size in the paper tray, or
perform Form Feed.
Also, if [Sub Paper Size] in the System Menu is set to [Auto],
printing is performed assuming letter size and A4 size to be
the same size. For example, When a PDF file set to A4 size pa-
per is printed using PDF Direct Print and letter size paper is
installed in the paper tray, the file will print out. This applies
similarly to the opposite case.
Status Possible Causes, Descriptions, and Solutions