Operating Principles Of Electric Circuitry; Overview; Features - Epson Stylus Photo RX700 Service Manual

EPSON Stylus Photo RX700

2.3 Operating Principles of Electric Circuitry

2.3.1 Overview

The major circuit boards of Stylus Photo RX700 are as follows:
Main Board:
Power Supply Board:
Panel Board:
CCD Unit Board (Scanner):

2.3.2 Features

High-Speed SPC is realized without HUB, thanks to employment of USB 2.0
multi-end point.
An SOC incorporating the printer controller, scanner controller, PT controller
and CPU Super Macro is realized.
Only one CPU (NA85E 2S by NEC) controls the printer, scanner and PT
section.
Equipped with one 64-Mbit Flash ROM (with 16-bit bus width) and one 32-
Mbit Flash ROM (with 16-bit bus width).
Equipped with one 256-Mbit SDRAM (16-bit bus width) and one 128-Mbit
SDRAM (16-bit bus width) (two SDRAM in total) for ASIC local buses, and
one 256-Mbit SDRAM (16-bit bus width) for CPU bus.
Two motor driver ICs (RENESAS M63160J) are mounted, each of which
controls two DC motors and one stepping motor.
The band width is ensured by setting the operating frequency of the local
SDRAM of SOC at 96 MHz.
High-speed processing is ensured because all the processing from scanning to
binarization, Microweave, and image buffer generation is carried out inside
the SOC, without via the CPU bus.
Equipped with a color LCD (2.5-inch low-temperature poly-silicon TFT
liquid crystal) as a standard feature.
With the aid of the low-current LED, power consumption is suppressed by
executing the following actions at transition to the power save mode.
•
Lowering the supply voltage for main power
•
Cutting off the photo-electric current of the photo sensor
•
Stopping the motor drive circuit
•
Stopping the UDL clock inside the ASIC
Operating Principles
C583MAIN
C583PSB/C583PSE
C583PNL
Operating Principles of Electric Circuitry
•
Entering the CPU core low consumption mode
High η power supply circuit
•
•
Stopping excitation of the printer motor
•
Stopping the head drive circuit
•
Turning off the CCD scanner power supply and stopping the excitation of the
scanner motor
•
Turning off the preview monitor
Figure 2-37. Main Board
Figure 2-38. Power Supply Board
Revision A
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