Samsung SCX-5115 - Manual (Page 30)

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4 Remove the drum cartridge from its bag and slide it into the
machine firmly until it locks into place completely.
5 Remove the starter toner cartridge from its bag. Gently
shake the cartridge to loosen the toner.
Thoroughly shaking the cartridge will assure maximum
copies per cartridge.
6 Slide the toner cartridge into the machine aligning the
cartridge to the left of the slot until it locks into place
completely.