Epson AcuLaser C1900 Reference Manual page 304

Paper Set XXX YYY
The paper loaded in the specified paper source (XXX) does not
match the required paper size (YYY). Replace the loaded paper
with the correct size paper and press the Start/Stop button to
resume printing. Or press the
print job.
If you press the Start/Stop button without replacing the paper,
the printer will print on the loaded paper even though it does not
match the required size.
Please wait
The developer cartridge to be replaced is moving to the
replacement position in the printer.
Printer Open
One or more of the following covers are open; the front cover,
Cover AB, Cover DM, or Cover C.
Print Overrun
The required time to process the print data exceeded the print
engine speed because the current page is too complex. Press the
Start/Stop button
button to cancel the print job. If this message appears again, select
On as the Page Protect setting in the control panel's Setup Menu.
If you continue to receive this message when printing a particular
page, try simplifying the page by limiting the number of graphics
or reducing the number and size of fonts.
You can also add more memory to the printer as described in
"Memory module" on page 324.
304
Troubleshooting
to resume printing. Or press the
Cancel Job button to cancel the
Cancel Job