Epson 1000 Reference Manual page 71

COPY END X/X [S]
Appears when you press the COPY END button to cancel
multiple-copy printing when the printer is off line. The first X is
the number of the current page and the second X the number of
copies selected in SelecType.
COVER OPEN [E]
The printer cover is open. Close it to continue printing. This
message also shows the amount of toner left in the imaging
cartridge. For example: A full toner amount is E*****F.
DATA [S]
The printer has received data but is not yet printing, or the
printer has received data and is off line. To resume printing,
press ON LINE if the printer is off line, or press FEED.
EJL [S]
The printer is in EJL mode. See "Emulation control languages"
in Chapter 1.
FACTORY RESET [S]
The printer is being initialized to the factory settings.
Troubleshooting 3-19