Brother HL-2600CN Service Manual page 193

3) Release the belt cartridge lock levers at both sides (left & right).
4) Pull out the OPC belt cartridge.
OPC belt cartridge
5) Prepare a new belt cartridge.
Pull and remove the tension release pins from both sides (left & right), and then
remove the protective sheet from a new OPC belt cartridge.
Tension release pin
Protective sheet
Belt cartridge lock levers
Fig.6-14
Fig.6-15
OPC belt cartridge
Fig.6-16
VI-21