Ricoh SP C250DN Operating Instructions Manual page 134

6. Maintaining the Machine
4. Hold the print cartridge and shake it from side to side five or six times.
Even distribution of toner within the bottle improves print quality.
5. Remove the protective cover from the print cartridge.
6. Check the toner color and corresponding location, and then carefully insert the print
cartridge vertically.
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DAC039
DAC037
DAC043