Brother International MP-21CDX Service Manual - Page 44

PR99052 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. Cap Sealing Spring plate Liquid ink bag Cap Sealing Spring plate Rib Spring plate Rib Waste ink absorber Ink cartridge BC Fig. 2.16 Rib Ink cartridge MY Spring plate II-14