Overview; Printer Mechanism - Epson Stylus PHOTO 820 Service Manual

EPSON Stylus PHOTO 810/820

2.1 Overview

This section describes the operating principles of the Printer mechanism and electrical
circuit boards. Like the previous printers (Stylus COLOR 480/580), the Stylus PHOTO
810/820 has only the following two circuit boards and does not have the control panel
*1
board.
Main board : C418 Main/Main-B board
Power supply board : C417 PSB/PSE board
*1
: Due to this, the Stylus COLOR 480/580 does not have switches (Power, Error reset,
Ink cartridge replacement) and LEDs. However, the Stylus PHOTO 810/820 has
them on the C418 Main board instead of the control panel board.
*2
: C418 Main/Main-B board is used for the Stylus C60 and Stylus Photo 810/820.
However, there is difference of ASIC & PROM mounted on the C418 Main board
between the Stylus C60 and the Stylus Photo 810/820.

2.1.1 Printer Mechanism

The Printer mechanism for the Stylus PHOTO 810/820 is newly designed. But, the
basic component of the Printer mechanism is almost the same as the previous printer
(Stylus COLOR 480/580).
This printer consists of Printhead, Carriage mechanism, Paper loading mechanism,
Paper feeding mechanism, Ink system (Pump mechanism including newly designed
Carriage lock mechanism, Capping mechanism including newly designed Wiper
mechanism).
Like the previous printers (Stylus COLOR 480/580), the Stylus PHOTO 810/820 is
equipped with two stepping motors; one for the Paper loading/feeding mechanism and
the Pump mechanism with the CR lock mechanism, and one for the CR mechanism.
The ASF unit for the Paper loading mechanism uses rear entry front eject system. And,
single LD roller in Holder shaft unit loads a paper to the Printer mechanism.
The Cap unit which adopts the valveless mechanism is newly designed on this printer
as follows.
No porous pad in cap
Cap unit with wiper
Operating Principles
Star wheel roller
*2
Overview
Paper eject roller
PF motor
PF roller
CR timing belt
CR unit
Change lever
Cap unit
Figure 2-1. Printer mechanism block diagram
Revision A
HP/PE Sensor
LD Roller
Pad holder
(Paper return plate)
LD pad
Compression spring
Clutch mechanism
Pump unit
CR motor
28