What should I do if I see a 'Cartridge is low' message?
When a 'Cartridge is low' or 'Cartridge is very low' message displays on the printer control panel or EWS, refer to the Solve Problems section for guidance on replacing toner cartridges. The manual provides specific troubleshooting steps for this condition.
From the official HP Color LaserJet Managed MFP E47528 Multifunction Printer manual, page 129
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