Service manual

Nozzle Select Signals
The nozzle select signals are output from gate array E05B21 to SED6110D0A on the head unit to select the
printhead nozzles. Nozzle select data (BHDAT/CHDAT) is HIGH for selected nozzles and LOW for
unselected nozzles. Nozzle select data translation timing is controlled by 64 clock signals (BHCLK/CHCLK),
one for each nozzle. After the print nozzles are selected, the common drive pulses are input to each PZT on
the selected nozzles via SED6110D0A. Then the ink dots are ejected from each selected nozzle’s PZT.
VH
COM
BH1C0/CH1C0
BH1C1/CH1C1
BH1D/CH1D
BHNCHG/CHNCHG
BHLAT/CHLAT
BHCLK/CHCLK
BHDAT/CHDAT
# 1
# 64
Figure 2-9. Common Drive / Nozzle Select Signal Timing
(Normal Dot Printing)
Stylus Pro XL+ Service Manual Operating Principles
Rev.A 2-9