Overview; Printer Mechanism - Epson Stylus Photo R1900 Service Manual

EPSON Stylus Photo R1900/R2880/R2000

2.1 Overview

This chapter explains the operating principles of the mechanical sections and electrical
circuits in this product. The main components of this product are as follows.
 Control circuit board
: C698 MAIN
 Power supply circuit board
: C698 PSB/PSE
 Control panel board
: C698 PNL
 LED board
: C698 PNL-B

2.2 Printer Mechanism

Like the conventional model, this product uses DC motors and stepping motors as
power sources. The following table describes the motor types and their applications.
Table 2-1. Motors
Motor Name Type
Used for carriage driving. Makes little noise during
DC motor with
CR Motor driving. The CR linear scale and CR encoder sensor
brushes
are used to control the motor.
Drives the Paper loading rollers at the time of fixed-
value paper loading or paper feed/eject operation. To
DC motor with
PF Motor grasp the paper feed pitch, the precision gear surface
brushes
is fitted with the PF scale and the PF encoder sensor
is used to control the motor.
Drives the Carriage Unit at the time of PG setting.
DC motor with
APG Motor The two APG Sensors are driven vertically to control
brushes
the motor.
4-phase, 48-pole Drives the paper feed operation of the ASF. Since
ASF Motor PM type stepping this is a stepping motor, any scales or photo sensors
motor to know the driving conditions are not required.
4-phase, 48-pole Drives the pump, wiper, etc. of the Ink System. Since
Pump Motor PM type stepping this is a stepping motor, any scales or photo sensors
motor to know the driving conditions are not required.
Operating Principles
Applications/Functions
Overview
The basic mechanism is almost same as the Stylus Photo R1800.
The schematic diagram below shows the printer mechanism.
PF Encoder
Sensor
Front Paper
Eject Roller
Rear Paper
Eject Roller
PF Roller PF Roller
CR Scale
Cover Open
Sensor
PW Sensor
Ink Mark
Sensor
Carriage
Unit
Ink System
Unit
Pump Motor
CD-R Sensor
Carriage
Shaft
Figure 2-1. Printer Mechanism Outline
Revision E
PF Scale PF Motor
APG Sensors
APG Motor
APF Sensor
Timing Belt
CR Encoder
Sensor
LD Roller
Retard
Roller
PE Sensor
ASF Motor
CR Motor
Confidential
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