EPSON Stylus PHOTO 2000P
Revision A
OPERATING PRINCIPLES
Electrical Circuit Operating Principles
48
2.2.2.1 Printhead Driver Circuit
The printhead driver circuit includes:
Common driver IC IC10 (E09A14RA)/IC10 (E09A15KA) directly
attached to the C304MAIN board.
Nozzle selector IC (IR2C95F or SED6125T0A) on the head board.
The common driver generates reference drive waveforms according to
the output signals from ASIC on the C304MAIN board. The reference drive
waveforms are amplified by the transistors Q3 and Q4 and then
transferred to the nozzle selector IC on the head board. Print data is
converted to serial data by the ASIC and then also sent to the nozzle
selector IC on the head board. Based on the serial data, the nozzle selector
IC determines the nozzles to be actuated. The selected nozzles (PZT) are
driven according to the drive waveforms produced by the common driver.
See Figure 2-14 for the printhead driver circuit block diagram.
Head common driver circuit
The head common driver IC10 (E09A14RA)/IC10 (E09A15KA)
generates reference head drive waveforms according to the output of
the following 9 signal lines: A0-A4, CLK1, CLK2, RST, FLOOR, and
DATA.
By the DATA signal output from the IC8 ASIC (E05B70**), the original
data for the head drive waveform is written in the memory in the IC10/
IC11. Addresses for the written data are determined by the A0 - A4
signals, and, of among, data used to determine the waveform angles
is selected. Then, setting the selected data, producing trapezoid
waveform value, and canceling the data are performed by the rising
edges of the CLK1 and CLK2 signals.
Head nozzle selector circuit
Print data is converted into serial data by the ASIC (E05B70**). Then
the converted data is allocated to the six rows, the number of the
head nozzle rows, to be transferred to the nozzle selector IR2C95F
(Sharp) or SED6125T0A (EPSON) through the six signal lines (HS01 to
HS06). Data transmission from IC8 ASIC (E05B70**) to the nozzle
selector synchronizes with the LAT signal and SCK clock signal.
Referring to the transferred data, The nozzle selector IC selects the
nozzles to be activated, and the PZTs of the activated nozzles are
driven by the drive waveforms output from the head common driver.
Figure 2-14. Printhead Driver Circuit
AO
A1
A2
A3
A4
CLK1
CLK2
FLOOR
RST
DATA
DCLK
E
VCC
NPNB
PNPB
FB
COM
COM
COM
COM
VHV
VHV
CH
LAT
ENA
ENB
HLAT
HCH
CRAI0
CRAI1
SWCO
SWC1
COB
COA
THM
to CPU AN0 port
SI1
SI2
SI3
SI4
SI5
SI6
HS01
HS02
HS03
HS04
HS05
HS06
NCHG
HNCHG
SCK
HSOCLK
SP
HSOCMD
CN8
CN9
HWA0
HWA1
HWA2
HWA3
HWA4
HWCLK1
HWCLK2
HWFLR
HWRST
HWSDATA
HWSCLK
HWSLAT
IC10
Commom
Driver IC
IC 8 ASIC
E05B70CD
Nozzle Selecor IC
IR2C95F
Head Drive Pulse
F1
CN9
Содержание 2000P - Stylus Photo Color Inkjet Printer
Страница 5: ...5 Revision Status Revision Issued Date Description A May 11 2000 First Release ...
Страница 9: ...C H A P T E R 1 PRODUCTDESCRIPTIONS ...
Страница 31: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Страница 55: ...C H A P T E R 3 TROUBLESHOOTING ...
Страница 75: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Страница 118: ...C H A P T E R 5 ADJUSTMENT ...
Страница 138: ...C H A P T E R 6 MAINTENANCE ...
Страница 148: ...C H A P T E R 7 APPENDIX ...
Страница 166: ...04 03 01 02 for S E ASIA 03 03 06 05 MC 2000 EPSON STYLUS PHOTO 2000P No 6 Rev 01 10206 ...
Страница 167: ...805 804 804 800 802 803 801 806 806 08 MC 2000 EPSON STYLUS PHOTO 2000P No 7 Rev 01 10206 ...
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