Epson AcuLaser C1900 Reference Manual page 303

Menus Locked
This message appears if you try to change the printer's settings
through the control panel when the buttons are locked. You can
unlock them by using the EPSON WinAssist or WebAssist utility.
Refer to the Administrator's Guide for information.
Need Memory
The printer has insufficient memory to complete the current print
job. Cancel printing by deleting it from the print queue on your
computer, or by pressing the
To clear this error message, select Clear Warning from the control
panel's Reset Menu. See "How to access the control panel menus"
on page 199 for instructions.
To prevent this problem from happening again, add more
memory to your printer as described in "Memory module" on
page 324.
Offline
The printer is not ready to print. Press the
Optional RAM Error
The optional memory module may be corrupted or incorrect.
Replace it with a new one.
Paper Out XXX YYY
There is no paper in the specified paper source (XXX). Load paper
of the indicated size (YYY) into the paper source.
Cancel Job button on the printer.
Start/Stop button
Troubleshooting
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