Samsung C47x series User Manual page 110

Understanding display messages
a. Estimated cartridge life means the expected or estimated toner cartridge life, which indicates
the average capacity of print-outs and is designed pursuant to ISO/IEC 19798 (see "Available
supplies" on page 76). The number of pages may be affected by operating environment,
percentage of image area, printing interval, media, percentage of image area, and media size.
Some amount of toner may remain in the cartridge even when replace new cartridge appears
and the machine stops printing.
Samsung does not recommend using a non-genuine Samsung toner
cartridge such as refilled or remanufactured. Samsung cannot guarantee a
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 warranty.
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4. Troubleshooting