Printhead Driver Circuit - Epson STYLUS COLOR 3000 Service Manual

Printhead Driver Circuit

This printer has two separate printhead driver circuits for the black and color printheads. Each circuit has a
common voltage driver circuit attached to the circuit control board, and a nozzle selector circuit attached to
the printhead. Each of the black and color common driver circuits is composed of a hybrid IC H8D2813E
(IC22) and a terminal transistor. The black printhead nozzle selector circuit is composed of a 128-bit transfer
gate array IC IR2C72C, and the color printhead nozzle selector circuit consists of a 128-bit transfer gate
array IC IR2C72C (for cyan and yellow) and a 64-bit transfer gate array IC IR2C73C (for magenta). Printing
data is separated into common voltage signals and nozzle selection signals at the gate array E05B33 (IC6)
and is then transferred to the corresponding circuits. Figure 2-20 shows the printhead driver circuit block
diagram.
E05B33 (IC6)
BCHG,BKC
BND0/1,BMD0/1
SBDATA
BHCLK
BHLAT
BA/BBHDATA
BHNCHG
VHPR
SCLK,SSTB,SCLR
CCHG,CKC
CND1/2,CMD1/2
SCDATA
CHCLK
CHLAT
YHDATA
CHDATA
MHDATA
CHNCHG
C203 Main Control Circuit Board
EPSON Stylus Color 3000 Service Manual
(IC 22)
Common Driver
(IC 22)
Common Driver
Figure 2-20. Printhead Driver Circuit Block Diagram
EPSON Stylus COLOR 3000
IR2C72C
COM
Black
CLK
LAT
SI
NCHG
VHV
IR2C72C
COM
CLK
Cyan
LAT
Yellow
S3
S1
NCHG
VHV
IR2C73C
COM
CLK
Magenta
LAT
S2
VHV
Printhead Boards
2-23