Solution
1. Press [Menu].
2. Press [Left cursor] or [Right cursor] to select [FAX SETTINGS], and then press [OK].
3. Press [Left cursor] or [Right cursor] to select [RX SETTINGS], and then press [OK].
4. Press [Left cursor] or [Right cursor] to select [TONER SUPPLY LOW], and then press [OK].
5. Press [Left cursor] or [Right cursor] to select [RX TO MEMORY] or [KEEP PRINTING], and then press [OK].
6. Press [Stop/Reset] to return to the standby display.