Canon MultiPASS C5000 Service Manual page 91

5.3 Printing Signal
a) Black BJ cartridge drive control
Thr black BJ cartridge driving control is executed by dividing the head's 128 nozzles into 8
nozzles each). The odd blocks eject ink simultaneously, and the even blocks do so as well.
The control signals for the former are the block enable 1, 2, and 3 signals (BENB 1, 2, 3),
and for the latter the signals are the even/odd enable signals (Even/odd ENB).
The heat enable 0 and 1 (HENB 0, I), which are the heater drive control signals for ejecting
the ink, comprise the pre-pulse and main pulse. To constantly achieve optimum ink
ejecting, the internal conditions such as the head's rank, printer temperature, head
temperature are monitored, and the heater drive pulse width is varied before the pulse is
output. Also, the printing drive signal from the printcr controller is transferred to the BJ
The printing drive signal (HDATA) is latched and when the printing control signal and
driven, and the ink is ejected.
b) Color BJ cartridge drive control
The color B.J cartridge head's nozzle configuration differs from that of the black BJ
cartridge. (The black has 64 nozzles while the color has 24 nozzles each for Y, M, and C.)
Therefore, the numbcr of nozzles in each control block is different from that of the black BJ
cartridge. Also, since the heaters are driven simultaneously for each color, the heater drive
control signals used are the heat enable (HENB) 0, 1, 2, and 3 signals. Otherwise,
everything clsr is the same as with the black BJ cartridge.
For heat enable, the HENB 0, 1, and 2 signals drive the nozzle heaters for Y, M, and C.
Thr JIENB 3 signal drives the nozzle heater for black ink.
Figure 2-17 Printing Sequence (Black BJ Cartridge/HQ Mode)
Chapter 2: Technical Reference
2-23