Epson Stylus Color, Service Manual

Page: 38 / 151

Chapter2 Operating Principles
Rev. A
2-1
2.1 OVERVIEW
This section describes Printer Mechanism, electric circuit board (C206 PSB/PSE, C209 Main, C209PNL
board) of EPSON Stylus Photo.
2.1.1 Printer Mechanism
Unlike the previous EPSON Ink Jet printers, printer mechanism of EPSON Stylus Photo does not have
exclusive mechanism to change over paper feeding and pumping operation. In stead, this control is done
by the turning direction of paper feed/pump motor and changing the position of carriage at that time.
Also, unlike previous print heads, the print head of this printer became one unit combined with black,
CMY(Cyan, Magenta, Yellow), LM(Light Magenta) and LC(Light Cyan) head. Black head has 32 nozzles,
90 dpi(vertical direction) and CMY, LC, LM head has 32 nozzles for each color, 90 dpi (vertical direction).
Also, since these print head is driven by frequency 14.4KHz, this printer can print twice faster (200-dpi)
than Stylus Color even at 720-dpi high resolution printing. Since the head drive frequency of Stylus Color
was 7.2KHz, it was driven by 100-cps printing speed in order to perform 720-dpi printing.
Following figure2-1 shows outline of the printer mechanism
.
Platen Drive Mechanism
Paper Pickup Mechanism
Pump Drive Mechanism
Carriage Motor
Paper Feed Motor
Paper Pick Up
Trigger Lever
Carriage Unit
(Prinr Head Unit)
Timing Belt
Pumping Position
Figure 2-1. EPSON Stylus Photo Printer Mechanism Block Diagram