Overview; Printer Mechanism - Epson Stylus PHOTO 2000P Service Manual

EPSON Stylus PHOTO 2000P

2.1 Overview

This section describes the operating principles of the printer mechanism
and electrical circuit boards. The major components of the EPSON Stylus
PHOTO 2000P are:

Printer mechanism:

M4W60
Main board: C304MAIN Board
Power supply board: C298PSB/PSE Board
2.1.1 Printer Mechanism
Unlike other EPSON ink jet printers, the EPSON Stylus PHOTO 2000P uses a
DC motor as power source. The DC motor enables the printer to lower
noise during printing. Table 2-1 shows various motor types used in the
printer and their applications.
Table 2-1. Motor Types and Corresponding Applications
Table 2-2.
Motor Name Type
DC motor with
CR motor
brush
DC motor with
PF motor
brush
4-Phase / 48-
Pump/ASF
pole stepping
motor
motor
OPERATING PRINCIPLES
Application / Feature
Drives the carriage making little noise.
Works with a linear scale to monitor motor's
operating condition.
Supplies power to drive paper feeding
rollers used to send paper at specified
speeds and load/eject paper. To monitor
paper feeding pitch, a loop scale is attached
beside the high-precision gear.
Sends drive for pump operation and paper
feeding from ASF. Since this is a stepping
motor, it has no scales or photo sensors that
are used to monitor motor's operating
condition.
The basic structure of the printer mechanism is mostly common to the
Stylus COLOR 400, except that the Stylus PHOTO 2000P uses a Pump/ASF
motor. With this motor equipped, the paper loading mechanism and the
pumping mechanisms are independently driven, which allows the printer
to offer higher throughput.
Figure 2-1 shows the printer mechanism block diagram for the Stylus
PHOTO 2000P.
Intermittent Gear
PF Motor Pinion
PF Motor
Flashing Window
Photo Interrupter (Encoder)
Notched Roller
Carriage Unit
Printhead
Timing Belt
Cap Unit
(without a valve)
Pump Unit
CR Guide Shaft
PF Roller
Liner Scale
Figure 2-1. Printer Mechanism Block Diagram
Overview
Revision A
Rotary Encoder
PF Drive Gear (high precision)
Photo Interrupter (Encoder)
Detector Wheel
ASF Sensor
LD Roller Shaft
Loading Rollers
PE Sensor
Pump/ASF Motor
ASF/Pump
CR Motor Disengage Gear Train
PG Lever
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