Epson Stylus COLOR 3000 Service Manual - Page 63

E05B33 IC6, 3.2.5 Printhead Driver Circuit - driver 64 bit

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Operating Principles 2.3.2.5 Printhead Driver Circuit This printer has 2 separate printhead driver circuits for the black and color printheads. Each circuit has the common voltage driver circuit attached to the circuit control board, and the nozzle selector circuit attached to the printhead. The each of the black and color common driver circuits is composed of the hybrid IC H8D2813E (IC22) and the terminal transistor. The black head nozzle selector circuit is composed of the 128-bit transfer gate array IC IR2C72C, and the color head nozzle selector circuit consists of the 128-bit transfer gate array IC IR2C72C (for cyan and yellow) and 64-bit transfer gate array IC IR2C73C (for magenta). 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 2-20 shows the printhead driver circuit block diagram. Figure 2-20. Prinrhead Driver Circuit Block Diagram 2-22 Rev. A

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Operating Principles
Rev. A
2-22
2.3.2.5 Printhead Driver Circuit
This printer has 2 separate printhead driver circuits for the black and color printheads. Each circuit has the
common voltage driver circuit attached to the circuit control board, and the nozzle selector circuit attached
to the printhead. The each of the black and color common driver circuits is composed of the hybrid IC
H8D2813E (IC22) and the terminal transistor. The black head nozzle selector circuit is composed of the
128-bit transfer gate array IC IR2C72C, and the color head nozzle selector circuit consists of the 128-bit
transfer gate array IC IR2C72C (for cyan and yellow) and 64-bit transfer gate array IC IR2C73C (for
magenta). 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 2-20 shows the
printhead driver circuit block diagram.
E05B33 (IC6)
COM
IR2C72C
CN13
LAT
CLK
SI
COM
CN12
LAT
CLK
Magenta
Cyan
Yellow
NCHG
LAT
CLK
S2
IR2C72C
IR2C73C
VHPR
VHV
SCLK,SSTB,SCLR
S3
S1
COM
NCHG
VHV
VHV
Common Driver
Common Driver
C203 MAIN Control Circuit Board
Head Boards
Black Head
BHCLK
BHLAT
BA/BBHDATA
BHNCHG
BCHG,BKC
BND0/1,BMD0/1
SBDATA
CCHG,CKC
CND1/2,CMD1/2
SCDATA
CHCLK
CHLAT
YHDATA
CHDATA
MHDATA
CHNCHG
Figure 2-20. Prinrhead Driver Circuit Block Diagram