For the following:
Kyocera TK-332 MONO toner cartridge 20K yield at 5% coverage USA region
Kyocera FS-4000DN laser printer
Your toner cartridge will shut down at every cycle of 20K printed pages, leaving you unable to print, even though there may be plenty of toner left in the cartridge.
Slash printing costs by simply replacing the chips which shut the cartridges down, to extend toner cartridge life by up to 30-40%, or use the chip if you are refilling the cartridges, to get them working again.
Each chip lasts for one cycle of 20K printed pages, after which it must be replaced.

Regional Codes
WW – Worldwide, EXP – Worldwide except China, EUR – Europe, US – United States, NA – North America, SA – South America, AP – Asia Pacific, ME – Middle East, JPN – Japan SEA/AUS – South East Asia/Australia