Epson Aculaser M1200 series User Manual page 73

Caution:
c
Never touch the developing roller that is exposed after removing the protective cover;
otherwise, print quality may decline.
7. Carefully insert the developer cartridge into the photoconductor unit's casing until it clicks
into place, making sure that the pins on both sides of the developer cartridge are aligned with
the grooves on the casing.
EPSON AcuLaser M1200 Series
Replacing Consumable Products
User's Guide
73