Canon multipass c3000 Service Manual (en)

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5.3 Printing Signal
a) Black BJ cartridge drive control
The black BJ cartridge driving control is executed by dividing the head’s 128 nozzles into 8
blocks (16 nozzles each).  These blocks are further divided into odd and even blocks (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, 1), 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 printer controller is transferred to the BJ
head’s shift resistor according to the HLATCH timing.
The printing drive signal (HDATA) is latched and when the printing control signal and
heater drive control signal are output together, the heater for the applicable nozzles is
driven, and the ink is ejected.
b) Color BJ cartridge drive control
The color BJ 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 number 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 else 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.
The HENB 3 signal drives the nozzle heater for black ink.
Chapter 2: Technical Reference
2-25
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BE1 to BE 8 : Block Enable 1 to 8
E : Even Enable
O : Odd Enable
A : Heat Enable 0
B : Heat Enable 1
:
Figure 2-19 Printing Sequence (Black BJ Cartridge/HQ Mode)