Epson Stylus Color C70, Service Manual

Page: 38 / 216

EPSON Stylus COLOR C70/C80 Revision A
Operating Principles Overview 38
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.(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 C70/C80 has the following two kinds of printing
modes.
„
Economy dot printing
„
Variable dot printing (VSD1, VSD2, VSD3. 3types is all.)
The above two dot types are automatically selected depending on the media and the
resolution setting of the printer driver. The following explains each printing mode.
†
Normal dot printing
With this printer, Economy dot printing is basically used only during Economy
mode printing. The reason is that the resolution is low during Economy mode
printing, so that the dot size needs to be bigger. Economy printing consists of 2
shots.
†
Variable dot printing
This printing mode is developed to improve the power of graduation-expression.
This mode is basically the same as variable dot printing mode used on other
products /; small 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
almost all the papers.
Ink Path
PZT
Ink Cavity
Nozzle
Nozzle plate
PZT drive voltage