Epson R380 - Stylus Photo Color Inkjet Printer, Service Manual

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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
C C658PNL-B C653PNL
Card Board
C658STG Not equipped
USB Board
Not equipped C653IF