What should I do if the toner cartridge is empty?
If the toner LED blinks rapidly, it indicates that the toner cartridge needs to be replaced (refer to page 8.5). Turn off the printer, wait a few minutes for it to cool down, and then replace the old cartridge with a new one by following step-by-step instructions provided in the manual.
From the official HP Samsung Xpress SL M2071 Laser Multifunction Printer Series manual, page 8
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