What should I do if the toner cartridge LED is blinking slowly?
If the toner LED blinks slowly, there's a small amount of toner left in the cartridge. To temporarily improve print quality, remove the toner cartridge and shake it thoroughly. However, for optimal output, replace the toner cartridge.
From the official HP Samsung Proxpress SL M4080 Laser Multifunction Printer Series manual, page 28
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