Samsung Xpress CLX-419x series User Manual page 91

Available consumables
Depending on the options, percentage of image area and job mode used,
the toner cartridge's lifespan may differ.
When purchasing new toner cartridges or other supplies, these must be
purchased in the same country as the machine you are using. Otherwise,
new toner cartridges or other supplies will be incompatible with your
machine due to different configurations of toner cartridges and other
supplies according to the specific country conditions.
Samsung does not recommend using non-genuine Samsung toner
cartridge such as refilled or remanufactured toner. Samsung cannot
guarantee non-genuine Samsung toner cartridge's quality. Service or repair
required as a result of using non-genuine Samsung toner cartridges will not
be covered under the machine's warranty.
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3. Maintenance