It would be best if he just simply buy a quality remanufactured cartridge or OEM would be prefered.
I dont like refilling toner cartridges, and thats the reason why, that is a earth problem with the drum, and I am now worried that you could have shorten the high voltage power supply on your printer and to repair that would be very costly.
Remanfacturing is much more than replacing toner into the hopper, you have many other things to do clean out the waste toner hopper and replace the wiper blade and doctor blade and relube the drum, and vacuum the toner
inkjet cartridges before placing new toner in.
I am very much against refilling toners, I have done it myself and its nothing but trouble.
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