Epson Stylus Photo R390 User Manual

EPSON Stylus Photo R260/R265/R270, R360/R380/R390 Revision B
Operating Principles Electrical Circuit Operating Principles 26
2.2 Electrical Circuit Operating Principles
The electric circuits of the Stylus Photo R260/R265/R270 and R360/R380/R390
consist of the following boards.
2.2.1 Main Features
 Features common to R260/R265/R270 and R360/R380/R390
 The circuits support multi-common printing method that achieves high-speed
printing reducing the number of carriage movements.
 Features of C658Main Board (R360/R380/R390)
 The CPU incorporates an ASIC for controlling memory cards. The ASIC
achieves high-speed access to a card.
 Employs SOC06H that incorporates one main processor and six image
processing processors enabling concurrent processing for printing.
 16-bit DDR1-SDRAM (166 MHz) memory for image processing on the local
side enables a wide range of memory access.
 72 MHz SDRAM is on the CPU bus as a system memory enabling a wide
range of memory access.
 By employing a self-powered motor driver, the cost for supplying power to
the RTC (5V) and USB HostVCC (6V), and for motor drive circuit are
reduced.
 UBEC (Ultra Block Encode) allows MW buffer size to be reduced to one third
the conventional size.
 Equips a 3.5inch Color TFT LCD as standard.
 Features of C653Main Board (R260/R265/R270)
 The newly employed SOC achieves throughput enhancement. The
incorporated USB host function offers USB host High Speed compatibility.
 Operations to reduce power consumption
The printer carries out the following operations to go into sleep mode.
 Decreases the power voltage
 Shuts off photoelectric current of photo interrupter sensors.
 Stops the motor drive circuit.
 Stops the UDL clock in the ASIC.
 De-energizes the motors
 Stops the head drive circuit
 High-efficiency power supply circuit (R360/R380/R390 only)
 Goes into CPU core low-power consumption mode (R360/R380/R390 only)
 Cuts power for the preview monitor (R360/R380/R390 only)
 Goes into SDRAM self-refresh mode (R260/R265/R270 only)
Table 2-4. Main Boards & Model Numbers
Board Name R360/R380/R390 R/260/R265/R270
Main Board
C658MAIN C653MAIN
Power Supply Board
C653PSB
Panel Board
C658PNL + C658PNL-B C653PNL
Card Board
C658STG Not equipped
USB Board
Not equipped C653IF

Epson Stylus Photo R390 Specifications

General

Brand	Epson
Model	Stylus Photo R390
Category	Printer
Language	English