Overview; Printer Mechanism - Epson Stylus COLOR 880 Service Manual

EPSON Stylus COLOR 880

2.1 Overview

This section describes the operating principles of the printer mechanism and
electrical circuit boards. The EPSON Stylus COLOR 880 has the following
boards:
M ain board: C 378M AIN Board
P ow er supply board: C 378P SB /P S E B oard
P anel board: C 298P N L Board

2.1.1 Printer Mechanism

Unlike other EPSON ink jet printers, the Stylus C O LO R 880 uses DC motor for
power source. Use of the DC motor enable the printer to lower noise during
printing to a great extent. Table 2-1 shows the various motor types used in the
printer and their applications.
Table 2-1. Motor Types and Corresponding Applications
Motor Name Type
CR Motor DC with brush
PF Motor DC with brush
4-Phase 48-pole
Pump/ASF
stepping motor
Operating Principles
Application / Feature
Used to drive the carriage making little noise. A
a linear scale is used to monitor the motor's
operating condition.
• Drives paper feeding rollers used to send
paper at specified speeds and load/eject
paper.
• CR lock lever operation
• To monitor paper feeding pitch, a loop scale
is attached beside the high-precision gear.
Like the Stylus COLOR 800 and Stylus Pro
5000, this motor manages pump drive and
paper loading from ASF.
Since this is a stepping motor, it has no scales
or photo sensors that are used to monitor the
motor's operating condition.
The basic structure of the printer mechanism is mostly common to the Stylus
COLOR 400/600/440/640/740, except that the Stylus COLOR 880 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 as a result.
Figure 2-1 shows the printer mechanism block diagram for the Stylus COLOR
880.
Plain Gear
PF Motor Pinion
PF Motor
Flashing Window
(at 80th column)
Photo Interrupter
(Encoder for CR)
Star Wheel Roller
Bk I/C Sensor
CMY I/C Sensor
Carriage Unit
Printhead (one unit)
Timing Belt
Cap Unit
(without a valve)
Pump Unit
CR Guide Shaft
PF Roller
Liner Scale
Figure 2-1. Printer Mechanism Block Diagram
Overview
PF Drive Gear
Loop Scale
Encoder (PF)
ASF Sensor
Detector Wheel
Loading Shaft
Loading Rollers
PE Sensor
Pump/ASF Motor
(stepping motor)
CR Motor (DC motor)
PG Lever
Revision A
31