Print Signals - Canon BJ-W7000 Service Manual

ee CHAPTER 2OPERATION
2. Print Signals
Image data (IDATA) sent to the shift registor by the timing of DCLK is latched at the rising edge of LTCLK
signal according to the signals from the linear encoder. Image data is then input to the AND circuits of each
nozzle.
BENB 0, 1 and 2 signals are converted to eight signals by the 3 > 8 decoder, and are divided by eight
for each of the nozzles. The purpose of this is to divide the head drive to prevent a reduced load placed on
the power supply and delay in ink refilling.
For the ODD and EVEN signals, a pre-pulse intended to raise the head temperature to the appropriate
temperature and a main pulse for discharging ink are output. The pulse width of these pulse signals is variably
controlled according to the head rank and head temperature to stabilize the amount of ink discharge.
These signals and the HEAT signal are input to the AND circuit of each of the nozzles, and each of the
heaters are driven by their output.
! 1008 (10kHz)
~
uerk —S LSS
: Pe ,, =
IDATA = LOOSE! 70000cK 1
Data transmission to shift resistor
DCLK Tu. —TUUULL___
BENBO
BENBY 12K >
Figure 2-306