When toner cartridge empty，change or refill?

Refill：
At present, most of thetoner cartridge are produced by outsourced printing service providers. The distributors carry out the process of powder filling regeneration for the laser printing equipment. Before the process is generated, the user first needs to judge whether the laser printer has toner. In the case, when a white strip appears in the middle of the print, it can be judged that the toner cartridge is basically not much toner. The user can solve the problem by removing the toner cartridge after shaking the toner cartridge. After the toner cartridge is shaken, the middle white strip will appear again soon. If you have completely judged that the toner cartridge has no toner, you can prepare the powder.
After the outsourcing service provider or the distributor technical engineer comes to the door, the user is generally used to help the user to fill the powder. The tools for filling the powder are generally a vise, a blown balloon, a small screwdriver, a large screwdriver, a medical cotton, etc. Bottled toner. I guess try compatible toner cartridge likehp 202a toner is better.