Epson Stylus Photo Service Manual page 63

EPSON Stylus Photo
[Nozzle Selector Circuit]
The printing data is sent from the serial data Sl1,Sl2 and Sl3 of the gate array to the nozzle selector;
IR2C72C and IR2C73C on the head driver. Serial data Sl1 and Sl3 are handled by IR2C72C , and Sl2 is
handled by IR2C73C. The serial printing data is allocated; B(black)line and M line for Sl1, LM line and C
line for Sl2 , LC line and Y line for Sl3 ,and is transferred respectively in the order of nozzles from #1 to
#32.The printing data sends "H" level to the driving nozzles and "L" level to the non-driving nozzles.
2-26
Rev. A