C544 Main Circuit Board; Feature - Epson Stylus PHOTO RX510 Service Manual

EPSON Stylus PHOTO RX500/510

2.3.1 C544 Main Circuit Board

2.3.1.1 Feature

USB 2.0 with multi-end points allows high speed SPC without HUB
SOC with printer control, scanner control, PT control, CPU SuperMacro
1CPU (NA85E2C by NEC) controls printer, scanner and PT unit
256Mbit*16 SDRAM (2 units)
A6615 drives DC x 2 and DC x 2 with 1Chip to motor driver
SOC obtains wider band ranges by setting action frequency of local SDRAM
to 96MHz
Copy function allows faster process with SOC to scan, and to generate 2-
values, microwave, image buffer instead of going through CPU bus.
Low current allows LCD to reduce power consumption in low power mode as
follows:
•
Lowering power supply voltage
•
Shutting off optical current for optical sensor
•
SLEEP mode for motor drive
•
Saving the power for printer with no exciting motor
•
Saving the power for scanner by turning off the lamp
•
Equipped with printer tray open sensor
Operating Principles
Main Element location
Built-in CPU core
SOC IC6
(E01A49B*)
FLASH ROM
IC2
(MBM29PL32BM)
SDRAM
(K4S561632)
SDRAM
(K4S561632)
Card ASIC
IC14
(E09A49B*)
CF Socket Power
Controller IC15
(TPS2041A)
RTC circuit
IC1
(RTC9822)
Motor drive circuit
IC12
(A6615)
Head drive circuit
IC11
(E09A41RA)
Electric Circuit
Table 2-4.
Function
• Built-in NA85E2C core
• Built-in iLB RAM 12Kbyte, Built-in dLB RAM 4Kbyte
Built-in iCACHE 8Kbyte, Built-in dCACHE 8Kbyte
• Action frequency
CPU core
NPB macro (UART, TimerC/D, Prescaler)
User logic (scanner/photo print)
User logic (printer)
Local SDRAM
External bus clock
• Power supply voltage : internal 1.5 V, external 3.3 V
• Firmware
• 32MB, 16bit bus, 48pin, 3.3V drive
• System Memory (for CPU)
• 256 Mbit, 16 bit bus, 54pin, 133MHz (CL=2) minimum
• Work memory for copy function (image processing)
• 256 Mbit, 16 bit bus, 54pin, 133MHz (CL=2) minimum
• Bus clock : 64MHz , internal clock : 48MHz
• 3.3V Single power supply
• 8 pin PSOP
• Power control 1CH with current limit
Multiple IC
• EEPROM ( Default value, store various parameters)
• RESET
• TIMER
• CR motor, PF motor, scanner motor drive circuit
• Drive motor: 42V ±5%
• Head drive control (control port for SOC)
Revision C
:192MHz(SSCG)
:48MHz
:48MHz (SSCG)
:48MHz
:96MHz(SSCG)
:64MHz(SSCG)
18