Electrical Circuit Operating Principles; Main Features - Epson R260 - Stylus Photo Color Inkjet Printer Service Manual

EPSON Stylus Photo R260/R265/R270, R360/R380/R390

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.
Table 2-4. Main Boards & Model Numbers
Board Name R360/R380/R390
Main Board
C658MAIN
Power Supply Board
Panel Board
C658PNL + C658PNL-B
Card Board
USB Board Not equipped

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.
Operating Principles
R/260/R265/R270
C653MAIN
C653PSB
C653PNL
C658STG Not equipped
C653IF
Electrical Circuit Operating Principles
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)
Revision B
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