Oki B4545 MFP - Manual (Page 125)

Maintenance
126
Caution - The fusing unit located inside the printer may become very hot
during operation.
Caution - To avoid injury - do not touch.
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2 - Remove the drum/toner cartridge assembly. In order to protect the
environment, do not throw away the used toner cartridge. Used
cartridges should be disposed of in accordance with local regulations
concerning waste materials.
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3 - Unlock the toner cartridge by turning the blue locking clip as shown in the
illustration below.