Overview - Epson 890N - FX B/W Dot-matrix Printer Service Manual

EPSON FX-890/2190

2.1 Overview

This printer is divided into several main components for easy removal and repair. The
main components are:
C524MAIN: Control board
C524PSB/PSE/PSH: Power supply board
C524PNL: Operation panel board
Printer mechanism: Printhead, Carriage, Ribbon mechanism, Platen
gap adjustment mechanism, Paper feed
mechanism, Release mechanism
Housing: Upper case, Lower case, Rear sheet guide,
Knob, Printer cover
C524MAIN Board
The C524MAIN board consists of 2in1ASIC(CPU), EEPROM, PROM, DRAM,
PF Motor Driver IC, CR Motor Driver IC driver elements, and so on.
CR Motor Driver IC
Print Head
Driver
Figure 2-1. C524MAIN Component
Operating Principles
PF Motor Driver IC
2in1ASIC
E01A29CA
EEPROM
DRAM
C524 PSB/PSE/PSH Board
The C524 PSB/PSE/PSH power supply board consists of Transformer, Switching FET,
Regulator IC, Diode bridge, Fuse, Photo-coupler, and so on.
CN1
Figure 2-2. C524 PSB/PSE/PSH Component
Overview
Photo-coupler
Switching FET Transformer
Diode Bridge
Revision B
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