Canon BJC 50 Service Manual - Page 109

BJC-50 3.2 BJ Cartridge 3.2.1 Color BJ cartridge structure Part 4: Technical Reference The color BJ cartridge contains a 136-nozzle print head (64 black nozzles, 24 yellow nozzles, 24 magenta nozzles, and 24 cyan nozzles) for four colors. The print head, black ink cartridge, and color ink cartridges are designed to be replaced respectively. a) Air hole Each the black and colored ink cartridge has an air hole at the same pressure at the atmospheric pressure. b) Ink sponge The ink sponge in the black ink cartridge absorbs black ink. The color cartridge has three ink sponges, each of which absorbs each color ink. c) Ink supplier The ink supplier supplies a constant amount of ink to the connection among the head, black ink cartridge and color ink cartridge. d) Bubble jet head unit The bubble jet head unit consists of 136 nozzles and signal contacts. Each nozzle has two heaters located one in front of the other. By controlling the temperature of the heaters, the small and large dots can be printed. e) Holder The holder has a partition between the black ink cartridge and the color ink cartridge to prevent color mixture and to prevent from being mounted incorrectly the black ink cartridge and the color ink cartridge. Ink Supplier Ink Suppliers Ink Sponge Air Holes Ink Sponges Holder Bubble Jet Head Unit Figure 4-14 Color BJ Cartridge 4-21