Epson SureLab D3000 - Single Roll Operation Manual page 70

If the p light is flashing, the printer is operating. Wait until operation has stopped.
B
Prepare a new Ribbon cassette.
If both lines are too light during back printing, you need to replace both ribbon cassettes.
C
Slide out while slightly lifting the handle of the waste paper box.
The back printing unit is installed behind the waste paper box.
D
Grip the handle on the back printing unit, and pull it down and out.
Replacing Ribbon Cassettes
70