Epson EPL-N7000 - Manual (Page 362)

Troubleshooting 351
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Self Test
The printer is currently performing a self test and initialization.
Service Req xyyyy
A controller error or a print engine error has been detected. Turn
off the printer. Wait at least 5 seconds and then turn it back on. If
the error message still appears, write down the error number
listed on the LCD panel (xyyyy), turn off the printer, unplug the
power cord, and then contact a qualified service representative.
Sleep
The printer is currently in the power-save mode. This mode is
canceled when the printer receives print data or the Reset button
is pressed.
Toner Low
The imaging cartridge has less than 10% of toner remaining.
You can continue to print until the Replace Toner error message
appears. It is recommended that you wait until this message
appears before replacing the imaging cartridge as remaining
toner may spill during replacement procedure. When printouts
become faint, see “Replacing the imaging cartridge” on page 258
for instructions on replacing the imaging cartridge.
Note:
Replacement of the imaging cartridge is not yet necessary when the
Toner Low
message appears. Toner may remain in the imaging cartridge
and spill out if you remove the imaging cartridge at this level. Replace
the imaging cartridge when the Replace Toner message appears.
Unable Clear Error
The printer cannot clear an error message because the error status
still remains. Try solving the problem again.