Epson Stylus Photo R280/R285/R290/Epson Artisan 50/Epson Stylus Photo T50/T59/T60/P50 Revision C
Chapter 2 Operating Principles 2.1 Overview 23
Confidential
2.1 Overview
This chapter describes the operating principles of the printer mechanism and electric
circuit boards of Stylus Photo R280/R285/R290 and Epson Artisan 50/Epson Stylus
Photo T50/T59/T60/P50.
2.1.1 Printer Mechanism
The main components of the printer mechanism are shown in the table below.
The main control boards are shown in the table below.
Figure 2-1. Printer Mechanism Diagram
Table 2-1. Printer Mechanism Main Components
Component Function
CR Unit
Moves along the CR shaft to print on paper being powered by the CR motor.
The unit includes Printhead, PW sensor, and CR encoder sensor.
APG Unit
Moves the carriage upward/downward to adjust the platen gap being powered by
the PF motor. There are 4 preset levels of platen gap and the unit moves the
carriage to one of the levels according to the current carriage position detected by
the APG sensor.
PF Unit Rotates the PF roller shaft to feed paper being powered by the PF motor.
ASF Unit
Being powered by the PF motor, feeds paper loaded on the ASF into the printer
mechanism.
EJ Unit
Being powered by the PF motor, ejects paper or the CDR tray.
The EJ frame moves corresponding to the stacker position so that the frame
matches with the paper size.
Ink System
Located on the right side of the printer mechanism. Covers the printhead with the
cap holder when the printhead is not used, and draws waste ink out of the
printhead. The waste ink is sent to the Waste Ink Tray through the waste ink tube.
Table 2-2. Main Control Boards
Board Function
Main Board
Located on top of the printer mechanism and controls all over the
printer operations.
Power Supply Board
(P/S ASSY)
Located on the Lower Housing and generates required voltages for the
printer using the power supplied from the AC power line.
Panel Board Located inside the Panel Unit and controls the operation panel.
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