Epson ColorPage EPL-C8000 Service Manual page 139

EPSON EPL-C8000
Table 2-25. C235MAIN Board Major Components
Componant name Location
The RISC*-type CPU, which operates at 133 MHz
RISC-CPU
(internal) and 3.3V. (External: 66.66 MHz)
IC1
R4700-133
*RISC: Reduced Instruction Set Computer
Controls memory areas (SDRAM, Code-DIMM,
IPL/FONT ROM, Option ROM DIMM)
E05B51 (ASIC) IC2
Performs DMA.
Contains the following functions:
• CPGI (Color Photo & Graphics Improvement)
E05B53 IC23
• Controls video signals
• I/F for the engine controller board (MCU PWB)
Contains the following functions:
• Controls the IEEE1284 Parallel B
E05B40 IC17 • Controls the EEPROM (IC15)
• Controls the I/O of the control panel
• Controls the Type-B (1
Contains the following functions:
E05B52 IC14 • Interface for E05B51 and E05B40
• Controls the Type-B (2
Contains the following functions:
• PGI (Photo & Graphics Improvement)
• RIT (Resolution Improvement Technology)
E05B28 IC26
• I/F (Video I/F) for the Engine controller board
•
E05B54 IC22 CCNV (Color CoNVersion) ASIC (RGB
Contains the following functions:
• IPL and FONT (Upper 16-Bit data / Lower 16-
M80C25/26 IC8/9
• Has two mask ROMs (size: 512K bit x 16 bit
AD9561 IC25 8-bit PWM controller
The S-RAM (1M-bit), which is used as the high-
TC55V1325FF IC24
speed working RAM for Bit-bild in the E05B53.
Chapter 2 OPERATING PRINCIPLES
Function
st
channel)
nd
channel)
(MCU PWB)
Manages ON/OFF of the CONTROLLER FAN
Bit data)
(1MB) ) to store the control program and font
data.
Table 2-26. C235MAIN Board Major Components (Continued)
Componant name
93C86
41.1699C
66.6666C
ACT1284
NDB6020
M51953B
LM3411
CGS74C
Code DIMM
SDRAM DIMM
CMYK)
Location Function
The 4K-bit EEPROM, which stores the
IC15
printer setting infomation.
CR1 41.1699 MHz ( E05B53, E05B28)
66.6666 MHz ( CPU, SDRAM, E05B51,
CR2
E05B53)
IC18/19/21
Bus driver for the IEEE1284ECP
QF1 FET driven at 3.3 VDC
IC3 Reset IC
IC28 3.3-VDC regulator
IC29 Manages separation of the 66.66-MHz clock
Socket P. A DIMM with a 2M-bit FLASH ROM
CN3
equipped.
• Slot 0/1/2 (Standard: 32M-bit DIMM is installed
in the slot 0.)
• Slot 0: A DIMM with a capacity of 64MB or
more must be set in this slot.
CN7/8/9
• Slot 1/2: A DIMM with a capacity of 32/64/
128MB must be set in this slot.
• The maximum memory capacity acceptance
for the C235MAIN board is 256MB.
Rev. B
2-78