Printhead Driver Circuit - Epson Stylus COLOR 1520 Service Manual

EPSON Stylus &2/25 1520

2.3.2.5 Printhead Driver Circuit

This printer has 2 separate printhead driver circuits:for the black head and for the color head. Each circuit
has the common voltage driver circuit attached to the MAIN board and the nozzle selection circuit
attached to the head driver circuit board. The common driver circuits for the both black and color heads
are composed of the hybrid ICs (IC19) and the terminal transistors. 128-bit transfer gate array IC
IR2C72C is used for the black head nozzle selection circuit and 128-bit transfer gate array IC IR2C72C
(for cyan and yellow) and 64-bit transfer gate array IC IR2C73C (for magenta) are used for the color head
nozzle selection circuit. Printing data is separated into the common voltage signal and the nozzle selection
signal at the gate array E05B33 (IC6) and is then transferred to the corresponding circuit. Figure 2-24
shows the printhead driver circuit block diagram.
Figure 2-24. Prinrhead Driver Circuit Block Diagram
2-24
Rev. A