Epson EPL-6200 Reference Manual page 373

The installed developer cartridge is not a genuine EPSON
product. The use of such products may damage the printer and
cause the print quality to decrease. Remove the currently installed
cartridge and replace it with a genuine EPSON cartridge by
following the instructions under "Developer Cartridge" on page
306.
To continue using the currently installed developer cartridge,
press Continue on the EPSON Status Monitor 3 window that
appears to clear the error.
Developer Cartridge Memory Error
Control panel: Ready light on, Error light flashing
A memory read/write error has occurred. Try reinstalling the
developer cartridge or replacing the current cartridge with a new
one by following the instructions under "Developer Cartridge"
on page 306. If this still does not resolve the problem, turn the
power off and then on again.
Toner Out
Control panel: Ready light on, Error light flashing
The developer cartridge is out of toner. Replace the developer
cartridge by following the instructions under "Developer
Cartridge" on page 306. To clear this error and print a single sheet,
press Continue on the EPSON Status Monitor 3 window that
appears to clear the error. After that, this error will occur again
until the developer cartridge is replaced. If you set the Toner Out
Error setting to Off, you can continue printing even when this
error occurs.
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Troubleshooting