About The Bj Cartridge; Bj Cartridge Structure; Bj Cartridge Print Drive Control; Bj Cartridge Identification - Canon BJC-3000 Service Manual

Part 5: Appendix

1.4 About the BJ Cartridge

1.4.1 BJ cartridge structure

The Black BJ cartridge (BC-30) consists of a multi-drop bubble jet head with 160
nozzles in a vertical array. The ink tank is removable from the BJ cartridge. Pigment
is used as the ink.
Color/Photo BJ cartridges (BC-33/BC-34Photo) have a multi-drop bubble jet head
with a total of 192 nozzles, in 4 colors, with 48 nozzles each, in a vertical array. The
ink tanks of each color are removable. The black ink used for the color cartridge is
pigment; for the other three colors including PhotoBlack, dyes are used.

1.4.2 BJ Cartridge print drive control

The Black BJ cartridge (BC-30) executes the same print drive control as in the BJC-
6000.
Color/Photo BJ cartridges, also execute the same print drive control as the
Color/Photo BJ cartridges used in the BJC-6000 (BC-31/BC-32Photo: 48 nozzles
colors, a total of 144 nozzles), although the number of nozzles is different.

1.4.3 BJ cartridge identification

This printer provides the function to detect the both BJ cartridge currently installed
and the head rank, using five signals HCLK (pin 13), HDATA (pin 9), HLAT (pin 19),
HRESET (pin 29), and DIR (pin28) of the cartridge signal contacts to communicate
serially with the bubble jet head unit.
Depending on the heater property variations of the bubble jet head unit generated in
manufacturing, all BJ cartridges can be classified into 24 types. The printer performs
optimized ink ejection while correcting for the heater property variations.
If the printer is turned on when a BJ cartridge installed in the carriage cannot be
correctly identified or when a BJ cartridge is not installed, the carriage automatically
moves to the cartridge replacement position, regardless of its previous position.
Also, if the printer is turned on and the cartridge is removed except during
replacement, a displaced cartridge error will occur.
Black BJ Cartridge
Nozzle160
Nozzle1
Figure 5-10 Nozzle Arrangement
5-10
Color/Photo BJ Cartridge
Nozzle192
Black 48 Nozzles
8 Dummy Nozzles
Cyan 48 Nozzles
8 Dummy Nozzles
Magenta 48 Nozzles
8 Dummy Nozzles
Yellow 48 Nozzles
Nozzle 1
BJC-3000
3