EPSON Stylus PHOTO 895/785EPX/915/825
Revision B
Operating Principles
Overview
34
Nozzle Layout
Black: 48 nozzles (120 dpi)
Color: 48 nozzles x5(Cyan, Magenta, Yellow, Light cyan, Light magenta)(120dpi)
The nozzle layout when viewed from the back surface of the head is shown below.
Figure 2-3. Nozzle Layout
2.1.2.1 Printing Process
This section explains the process in which the printheads of On-Demand inkjet printers
eject ink from each nozzle.
1.
Normal State:
When no printing signal is sent from PC, or no PZT drive voltage is applied, PZT
does not change shape, therefore PZT does not squeeze the cavity. Ink pressure
inside the cavity is kept normal.
2.
Ejecting State:
When the print signal is output from the C408/C498 MAIN board, IC (Nozzle
Selector) located on the printhead unit latches data once by 1-byte unit. An
appropriate PZT latched by the nozzle selector is pushed into the cavity by the
common voltage applied from the main board. By this operation, ink stored in the
cavity spurts out from nozzles.
Figure 2-4. Printhead Printing Process
Ink Path
PZT
Ink Cavity
Nozzle
Nozzle plate
PZT drive voltage
Summary of Contents for Stylus Photo785EPX
Page 1: ...EPSON STYLUSPHOTO895 785EPX 915 825 Color Inkjet Printer SEIJ01001 SERVICE MANUAL ...
Page 9: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Page 31: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Page 55: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 69: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Page 116: ...C H A P T E R 5 ADJUSTMENT ...
Page 137: ...C H A P T E R 6 MAINTENANCE ...
Page 146: ...C H A P T E R 7 APPENDIX ...
Page 175: ...EPSON STYLUS PHOTO 825 915 331 451 450 A C498 ELEC 001 Rev 01 No 03 200 300 330 A ...
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