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You can check the drum and fusing unit life by hitting the "Machine status" button and selecting "supplies" tab. The only time you would need to replace the developer is if there is a mechanical problem with your developer housing and you need to replace the whole housing assembly. The toner / developer system in this machine replenishes the system as you use it as the toner contains developer in it and old developer trickles out of the DV housing into the waste toner to keep it fresh.
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