What should I do if the toner cartridge life is low?
When a toner depletion indicator LED blinks slowly, you can manually rock the toner cartridge to redistribute remaining toner particles and improve print quality temporarily. However, this might not resolve all printing issues such as light areas on paper or white streaks in some cases. (Pages 33-34)
From the official HP Samsung Xpress SL M2885 Laser Multifunction Printer Series manual, page 33
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