While drum cartridges are generally user-replaceable supplies, simply swapping your old drum for the new one is not always sufficient to get the new drum unit to work in your system.
Often, you will also need to reset the drum counter manually. Besides its effect on the counters themselves, this simple process informs your printer that a new drum was installed and allows it to recognize the new cartridge unit.
Check your printer’s users guide for this function.
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