Brother HL-3400CN Series User Manual page 36

USER'S GUIDE
2–6
3. Remove the orange OPC Belt Tension Release Pins from both sides of
the OPC Belt Cartridge.
Fig. 2-7 Remove the Pins
4. Remove the Protective Sheet from the OPC Belt Cartridge.
Fig. 2-8 Remove the Protective Sheet
5. Insert the OPC Belt Cartridge into the printer cartridge guide with the
flat side facing you.
Fig. 2-9 Insert the (OPC) Belt Cartridge
6. Lock the Belt Cartridge Lock Levers by pushing them backward until
they click into place.
7. Close the Top Cover and the Front Cover.