Replacing the Drum Cartridge
8 Replace the toner cartridge and close the side cover, inner cover, and
top cover (Steps 7 and 8 on page 21).
When the display shows [TONER EXCHANGED?] / [1 = NEW, 2 = OLD],
press 
for “OLD” and then START (Steps 9 and 10 on pages 21 and 22) .
When finished, reset the drum cartridge counter as explained on page 22.
11. Maintenance
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