Epson Stylus Photo RX585 - 2.2 Operating Principles of Electric Circuitry

EPSON Stylus Photo RX585/RX595/RX610 Revision B
Operating Principles Operating Principles of Electric Circuitry 37
2.2 Operating Principles of Electric Circuitry
2.2.1 Overview
The major circuit boards of Stylus PHOTO RX585/595/610 are as follows:
 Main Board: C693MAIN
 Power Supply Board: C693PSB/PSE
 Panel Board: C693PNL + C685PNL-B
2.2.2 Features
 Based on the circuit mounted on the previous model Stylus PHOTO RX585/595/
610, this printer is equipped with an EEPROM and a reset circuit individually to
reduce the cost. This is achieved by removing a complex RTC circuit that is
mounted on the previous model.
 With the increase in printing speed, the Case Open Sensor is newly added.
 Equipped with a color LCD (2.5-inch TFD) as a standard feature
 Power consumption reduced by executing the following actions at transition to the
power save mode
System control: Stopping part of clock inside the ASIC
Motor drivers entering sleep mode
Head DAC IC entering standby mode
Turning off power to the LCD
Printer control: Releasing the printer motor short brake
Cutting off the photo-electric current of the photo sensor
Scanner control: Stopping scanner motor chopping
Cutting off CIS & CIS LED current
Others: SDRAM entering self-refresh mode (automatic entering by ASIC
setting)
2.2.3 Circuit Board Constitution
Table 2-5. Circuit Board Constitution
Circuit Board Description
Main
Board
System
section
 Oscillation circuit (48MHz ± 100 ppm)
 SSCG setting circuit
 ASIC incorporating CPU core (E01A73B*)
• Package: 352-pin PBGA
• Power voltage: Internal 1.0 V ± 0.1V External 3.3V ± 0.3V
•CPU core: V850E2
• Operation frequency: Inside of CPU core: 288MHz (SSCG)
SD-RAM controller: 96MHz (SSCG)
PT/ scanner section: 48MHz (SSCG)
Hardware JPEG decompression, AFP: 96MHz (SSCG)
Printer section: 48MHz (No SSCG)
Printer drive timer base clock: 48MHz (No SSCG)
• Built-in command RAM: 40 kByte (iLB-RAM)
• Built-in data RAM: 16 kByte (dLB-RAM)
 Memory (FLASH ROM (64 Mbits), local SDRAM (256 Mbits), SERIAL
FLASH ROM (512 Kbits)
 EEPROM (4Kbit)
 Reset circuit
 USB interface (both the HOST and DEVICE support High-Speed)
 Panel interface
 Color LCD interface
Power Supply
section
 Power supply control circuit (PSC/ESAVE)
 DC-DC converter circuit
 Overvoltage protection circuit
 Power-saving controller
Printer
section
 Head drive circuit
 CSIC interface
 CR Motor control/driving circuit
 PF Motor control/driving circuit
 Sensor circuit
Card I/F
section
 Memory card control ASIC (USX2007-NW-**)
 Memory card connector (CF connector, 4 in 1 connector)
 Power supply control circuit for CF
Scanner
section
 Scanner motor control/driving circuit
 Scanner interface circuit
 Sensor circuits
Panel Board
 LED lighting circuit
 Switch reading circuit
 Case open sensor circuit
Power Supply section
 42 V generation circuit (flyback converter)
LCD Board
 Module made by SEID (2.5-inch alpha TFD)