Brother MFC-640CW - Manual (Page 214)

S - 9 SPECIFICATIONS
Consumable items
Ink The machine uses individual Black, Yellow, Cyan
and Magenta ink cartridges that are separate from
the print head assembly.
Service Life of Ink
Cartridge Black - Approximately 500 pages at 5% coverage
Yellow, Cyan and Magenta - Approximately 400
pages at 5% coverage
The above figures are based upon the following
assumptions:
• Continuous printing at a resolution of 600 x 600
dpi in normal mode after installing new ink
cartridge;
• The printing frequency;
• The number of pages printed;
• Periodic, automatic, print head assembly cleaning
(Your machine will clean the print head assembly
periodically. This process will use a small amount
of ink); and,
• Ink remaining in cartridge identified as “empty”
(It is necessary to leave a small amount of ink in
the ink cartridge to prevent air from drying out and
damaging the print head assembly).
Replacement
Consumables LC41BK, LC41C,
LC41M, LC41Y