Epson STYLUS COLOR 580, Service Manual

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EPSON Stylus COLOR 580 Revision A
Operating Principles Overview 32
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.(Refer to Figure 2.1.2.2.)
Figure 2-3. Printhead printing process
2.1.2.2 Printing Method
For print dot system, Stylus COLOR 580 has the following two kinds of printing
modes.
n
Multiple shot printing
n
Variable dot printing
The above two printing modes are automatically selected depending on the media and
the resolution setting of the printer driver. The following explains each printing mode.
o
Multiple shot printing
This printing mode is developed to improve the print quality on plain paper or
transparencies in low resolution. The multiple shot printing mode uses normal dot
and the number of dot shots varies from 1 shot to maximum 4 shots depending on
the print data to enable sharp image output even in a low resolution.
o
Variable dot printing
This printing mode is developed to improve the print quality on exclusive paper.
This mode is basically the same as variable dot printing mode used on other
products /; micro dot, middle dot, and large dot compose this mode. Print dot size
varies according to print data and this mode enables even sharper image output on
exclusive paper.
Ink Path
PZT
Ink Cavity
Nozzle
Nozzle plate
PZT drive voltage