Epson 680Pro - LQ B/W Dot-matrix Printer - 2.1 Overview

EPSON Stylus COLOR 680/777/77i Revision B
Operating Principles
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2.1 Overview
This section describes the operating principles of the printer mechanism and electrical
circuit boards. The Stylus COLOR 680/777/777i has the following boards:
o Main board: C383 MAIN (C383 MAIN-B)
NOTE: C383 MAIN-B is compatible with C383 MAIN. Only some chips or parts
are different from each other due to different producers.
o Power supply board: C383 PSB/PSE
o Panel board: C383 PNL
2.1.1 Printer Mechanism
The printer mechanism for Stylus COLOR 680/777/777i is designed newly. But, the
basic component of the printer mechanism is same as previous product.
This printer consists of Print Head, Carriage Mechanism, Paper Feeding Mechanism,
Paper Loading Mechanism, Ink System (Pump Mechanism, Cap Mechanism, and
Carriage Lock Mechanism).
Like other EPSON ink jet printers, the Stylus COLOR 680/777/777i is equipped with
two stepping motors; one for ASF, Paper feeding/ Pump mechanism, and one for CR
mechanism. ASF unit uses rear entry front eject system. This ASF unit is also designed
newly and single LD roller loads the paper to the printer mechanism.
For cap assembly, Stylus COLOR 680/777/777i uses valveless mechanism; new design
for this model.
Figure 2-1. Printer Mechanism block diagram
ASF Hopper Spring
CR Motor
Paper feed back plate
Paper separation pad
Clutch mechanism
CR unit
PF Roller
HP/PE/IC Sensor sensor
LD Roller
Pump Assembly
Paper Eject Roller
Star Wheel Roller
CR Timing belt
CR lock lever
PF Motor
Cap Assembly