EPSON Stylus
COLOR
1520
Rev. A
2-26
Color head nozzle selector circuit
The operating principle for the color head is the same as for the black head except that color print is
performed with data for 3 different colors: yellow, cyan, and magenta. The operating principle for the
color head is as described below:
Nozzle selection circuit
The nozzles for the color head are divided into 3: for yellow, cyan, and magenta with 64 nozzles
for each of them. The nozzle selection signals for each color (YHDATA for yellow, MHDATA for
magenta and CHDATA for magenta) are sent simultaneously in serial data. The clock signal
(CHCLK) is composed of the pulses from #1 to #64. The nozzle selection signal and the
corresponding clock signal are synchronized by the latch signal (CHLAT) to determine the nozzle
to use. However, the numbers used for the pulses and corresponding nozzles are not the same.
Common driver circuit
The common voltage (VH) is established to correspond to each of the black printhead
characteristics. This value is stored in advance in the EEPROM when the printer power is off. At
power on, the value is stored in the RAM. The gate array E05B33 (IC6) outputs the serial data
SCDATA of the voltage control signals to the common driver circuit referring to this value. The
control signals for the serial transmission SCLK, SSTB and SCLR are used for this operation.
The thermistor controls the common voltage by outputting the signals to compensate for changes
in ink viscosity.
COM
CHLAT
YHDATA
CHCLK
#1
#64
CKC,CCHG
CHNCHG
CND0/1,
CMD0/1
CHDATA
MHDATA
Head Drive Voltage (VH)
Figure 2-26. Color Data Transmission Timing
Summary of Contents for 1520 - Stylus Color Inkjet Printer
Page 138: ...Maintenance Rev A 6 5 8 9 10 10 10 10 10 10 10 10 Figure 6 2 Lubrication Points 2 ...
Page 146: ...Appendix Rev A A 7 A 2 Circuit Diagrams Figure A A 2 C211 MAIN B Board Circuit Diagram 1 2 ...
Page 147: ...EPSON Stylus COLOR 1520 Rev A A 8 ...
Page 148: ...Appendix Rev A A 9 Figure A A 3 C211 MAIN B Board Circuit Diagram 2 2 ...
Page 149: ...EPSON Stylus COLOR 1520 Rev A A 10 ...
Page 152: ...Appendix Rev A A 13 A 3 Component Layout Figure A A 6 C211 MAIN B Board Component Layout ...
Page 153: ...EPSON Stylus COLOR 1520 Rev A A 14 Figure A A 7 C172 PSB Board Component Layout ...
Page 154: ...Appendix Rev A A 15 Figure A A 8 C172 PSE Board Component Layout ...
Page 156: ...Appendix Rev A A 17 Figure A A 10 Stylus COLOR 1520 Exploded Diagram 2 ...
Page 157: ...EPSON Stylus COLOR 1520 Rev A A 18 Figure A A 11 Stylus Color 1520 Exploded Diagram 3 ...
Page 165: ...EPSON SEIKO EPSON CORPORATION ...
