Operating Principles
Rev. A
2-25
Common driver circuit for the black head
Gate array E05B33 (IC6) sends serial data to the head nozzle selection circuit on the head to select
nozzles to activate. Then the data is transferred to the common driver on the control board to drive
all piezos that are corresponding to each nozzle. The operating principles for the black head is as
follows:
Nozzle selection circuit
Nozzles for the black head are divided into 2 rows with 64 nozzles on each, and 2 deferent types
of nozzle selection signal (BAHDATA and BBHDATA) are sent in serial data to the corresponding
row. Clock signal (BHCLK) is composed of the pulses from #1 to #64. The nozzles to be
activated is determined by the nozzle selection signal synchronized with the clock signal by the
latch signal (BHLAT). 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) refers to the value for the
common voltage when outputting the serial data SBDATA as the voltage control signals to the
common driver circuit. The serial data transmission control signals (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
BHLAT
BA/BHDATA
BHCLK
#1
#64
Head Drive Voltage (VH)
BKC,BCHG
BHNCHG
BND0/1,BMD0/1
Figure 2-25. Black 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 ...
