Overview; Printer Mechanism - Epson Stylus Photo 720 Service Manual

EPSON Stylus Photo 720 / EPSON Stylus Photo EX3

2.1 Overview

This section describes the operating principles of the printer mechanism and electrical
circuit boards. The Stylus Photo 720 / Stylus Photo EX3 has the following boards:
Main board: C301MAIN
o
Power supply board: C301PSB/PSE
o
Panel board: C209PNL Board (Stylus Photo 720)
o
C366PNL Board (Stylus Photo EX3)

2.1.1 Printer Mechanism

Stylus Photo 720 / Stylus Photo EX3 is based on Stylus Photo 700 / Stylus Photo EX
and the basic specifications for its mechanism are almost same as Stylus Photo 700 /
Stylus Photo EX.
This printer consists of Print Head, Carriage Mechanism, Paper Feeding Mechanism,
Paper Loading Mechanism, Ink System (Pump Mechanism, Cap Mechanism, and
Carriage Lock Mechanism).
Like other EPSON ink jet printers, the Stylus Photo 720 / Stylus Photo EX3 is
equipped with two stepping motors; one for ASF/ paper feeding/ pump mechanism,
and one for CR mechanism. ASF unit uses rear entry front eject system; this design is
the same as Stylus Photo 750 / Stylus Photo 1200.
For cap assembly, Stylus Photo 720 / Stylus Photo EX3 uses valveless mechanism;
new design for this model.
Figure 2-1 on page 31 shows the outline of the printer mechanism.
Operating Principles
The table below shows the compatibility of the mechanical units among Stylus Photo
700, Stylus Photo 750 and Stylus Photo 720.
Table 2-1. Mechanical Unit Compatibility
Stylus Photo 700 /
Stylus Photo EX
Printhead E-Chips
CR motor
(coil resistance)
PF moto
(coil resistance)
ASF unit
Paper feeding
Bottom edge: 14mm
mechanism
Pump unit
Capping unit Valve A
Frame parts Stylus Photo 700 type
Main board C233MAIN
PSB/PSE board C206PSB
Overview
Stylus Photo 750 /
Stylus Photo 1200
U-Chips
7.8Ω 7.8Ω
7.8Ω 8.8Ω
--- Quiet noise type
Bottom edge: 3mm
enabled
Type A Type B
Valve B
Stylus Photo 750 type
C259MAIN
C257PSB
Revision A
Stylus Photo 720 /
Stylus Photo EX3
E-Chips +
7.8Ω
8.8Ω
Quiet noise type
Bottom edge: 3mm
enabled
Type A
Valveless
Stylus Photo 750 type
C301MAIN
C301PSB/PSE
30