Ink Cartridge - Brother MP-21C Service Manual

3.3

Ink Cartridge

Ink Cartridge BC
A liquid ink bag is placed inside the ink cartridge. By inserting the ink cartridge into the
printer, an ink needle punctures the seal and is inserted into the ink bag. Ink is supplied to
the print head through the ink needle and the ink tube. 3 needles in total stick into the Ink
cartridge BC. 2 of them are for the ink supply of Black and Cyan and the other one is for
the waste ink.
The spring plate which is placed over and under the ink bag applies pressure to the ink
bag in order to keep the most suitable internal pressure for printing.
When operating the purge system, the waste ink of all 4 colors is delivered from the
Purge unit ASSY to the waste ink absorber through the waste ink tube and needle.
Ink Cartridge MY
The basic structure of the Ink cartridge MY is the same as the Ink cartridge BC but there
is no waste ink absorber. The Magenta and Yellow waste ink is delivered to the waste
ink absorber inside the Ink cartridge BC, the ink cartridge MY does not have a waste ink
absorber. Therefore, only 2 needles stick into this cartridge.
Sealing
Cap
Rib
Ink cartridge BC
Spring plate
Spring plate
Waste ink absorber
Fig. 2.16
II-14
Liquid ink bag
Sealing
Cap
Rib
Rib
Ink cartridge MY
PR99052
Spring plate
Spring plate