Epson EPL-6100 Reference Manual page 176

The developer cartridge included with the printer prints up to
3,000 pages.
You need to replace the developer cartridge when a notice
message is displayed on the window of the EPSON Status
Monitor 3.
When the Toner light is on and the Error light is flashing slowly,
or a message is displayed on the EPSON Status Monitor 3 screen,
follow these steps to replace the developer cartridge:
1. Make sure the printer is turned off.
2. Make sure the output tray on top of the printer is lowered.
3. Open the printer cover by pressing the latch on the left side
of the printer and lifting the cover up all the way.
c
74 Replacing Consumable Products
Caution:
You must completely open the printer cover when replacing
the developer cartridge; otherwise, you may damage the
printer.