Epson 440 Service Manual page 66

Chapter2 Operating Principles
After the data transmission by the nozzle selector(IR2C72C, IR2C73C) is completed and a certain time
passes, trapezoidal wave form generated by the common drive circuit once sends electric current to the
PZT for the proper nozzles which are determined in the nozzle selector circuit. This motivates PZT and
ejects the ink in the cavity. The figure below shows normal dot data transmission timing in order to from
1-dot.
Figure 2-26. Common Drive Circuit Block Diagram
2-29
Rev. A