Printer Mechanism; Motors; Printer Mechanism Outline; Overview - Epson Stylus Photo R1800 Service Manual

EPSON Stylus Photo R1800/R2400

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 : C589 MAIN
Power supply circuit board : C589 PSB
Control panel board : C589 PNL
Control panel B board : C589 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
DC motor with
CR Motor
brushes
DC motor with
PF Motor
brushes
DC motor with
APG Motor
brushes
4-phase, 48-pole
ASF Motor PM type
stepping motor
4-phase, 48-pole
Pump Motor PM type
stepping motor
Operating Principles
Applications/Functions
Used for carriage driving. Makes little noise
during driving. The CR linear scale and CR
encoder sensor 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 grasp the paper feed pitch, the
precision gear surface 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. The two APG Sensors and Carriage
Shaft are driven vertically to control the motor.
Drives the paper feed operation of the ASF.
Since this is a stepping motor, any scales or
photo sensors to know the driving conditions are
not required.
Drives the pump, wiper, etc. of the Ink System.
Since this is a stepping motor, any scales or
photo sensors to know the driving conditions are
not required.
The basic mechanism is almost same as the Stylus Photo R800.
The most major difference is that this Stylus Photo R1800 is equipped with a
dedicated sensor to detect a open or close status of the Front Cover.
This prevents the Print Head from damaging by mistake.
The schematic diagram below shows the printer mechanism.
PF Encoder
Sensor
Front Paper
Eject Roller
Rear Paper
Eject Roller
PF Roller
CR Scale
PW Sensor
Ink Mark
Sensor
Carriage
Unit
Ink System
Unit
Pump Motor
CD-R Sensor
Carriage
Shaft
Figure 2-1. Printer Mechanism Outline
Overview
Revision B
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
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