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There are many times when HP laser printer shows low or empty toner error way sooner than the actual time. So if you have checked that the toner cartridge feels heavy, this means that you don’t need to refill the cartridges. If you feel that there is some pigmentation left in the cartridge and it is not empty, then you can just shake your cartridge really well. This old school trick will free up the toner particles which are stuck inside the walls and nooks. 
If you don’t know how to find reset buttons on ink cartridges then visit our blog.