Brother FAX-1820C - Manual (Page 154)

12 - 23 TROUBLESHOOTING AND ROUTINE MAINTENANCE
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Brother multifunction machines are designed to work with ink of
a particular specification and work to a level of optimum
performance when used with genuine Brother ink cartridges.
Brother cannot guarantee this optimum performance if ink or ink
cartridges of other specifications are used. Brother does not
therefore recommend the use of cartridges other than genuine
Brother cartridges with this machine or the refilling of empty
cartridges with ink from other sources. If damage is caused to the
print head or other parts of this machine as a result of the use of
ink or ink cartridges other than genuine Brother products due to
the incompatibility or lack of suitability of those products with this
machine, any repairs required as a result will not be covered by
the warranty.
If the Ink Empty message is on the display after you have
installed ink cartridges, check that the ink cartridges are
installed peoperly.