Epson Action Laser II - Manual (Page 139)

Replacing Consumable Parts
11. Press and at the same time. Make sure COVER OPEN
PCU 0 appears on the display.
12. Gently press down on the top of the printer cover until the latch
clicks shut.
Note: You cannot close the printer cover if you installed the
photoconductor unit incorrectly. If you cannot close the cover,
carefully remove and then re-install the photoconductor unit.
Close the cover.
13. Re-insert the toner cartridge into the printer by sliding it gently
into the opening until it locks in place.
Maintenance and Transportation
6-15