EPSON Stylus Color 600
Rev. A
2-2
8
[Nozzle Selector Drive Circuit]
In order to motivate the print head to carry out print ing, it is necessary to transmit the print data to the
appropriate nozzles, which becomes direct signals to dri v e PZT. This data transmission is performed
by the serial transport method, however the data out put for each black and CMY head is transmitted by the
parallel method. The figure bel ow shows data transmi ssion ci rcuit.
CLK(Clock) pulse considered as source of serial communication is commonly used for both black and
CMY. The serial data transmits data as 64-Clock unit, synchronizing with t hi s pulse. After the data
transmission of 64-Clock is completed, LAT(Latch) signal is activated and is hold temporari ly in the
IR2C72C(U101) At this time, since the number of nozzle for Color head i s fewer(21-nozzles) and dif ferent
from the ones for black head, 0 is transmi t ted forcefully for the dat a f or 43 nozzle (64-21=43).
VH
COM
NCHG
CLK
SI1
SI2
SI3
LAT
THM
Gate Array
E05B43(IC2)
U102
IR2C73C
For Cyan & Yellow
data latch
SI
SCLK
LAT
XCHG
COM
VHV
VD1/2
SI
SCLK
LAT
XCHG
COM
VHV
VD1/2
SI1
For Black & Magenta
data latch
Figure 2-25. Nozzle Selector Circuit Block Diagram