Table 2-2. Functions Of C205 Main Board Main Elements - Epson EPL-N1200 Service Manual

Operating Principles
Table 2-2 lists the functions of the C205 MAIN board main elements.

Table 2-2. Functions of C205 MAIN Board Main Elements

Element
MB86930 RISC CPU IC15
E05A91 ASIC IC1
E05B31 ASIC IC38
E05A93 ASIC IC11
E05B17 ASIC IC16
E05B27 ASIC IC43
Two 8 M-bit ROMs IC12,13
Two 8M-bit ROMs IC32,33
Option 8M-Bit ROM IC6
EEPROM IC5
SRAM IC17
IC18,19,20,
DRAM
21
2-18
Location
The CPU, which operates at 20 MHz, manages the video
controller operation.
This ASIC contains the following functions:
Address decoding
DRAM management (refresh control,
RAS/CAS control)
This ASIC contains the following functions:
Video signal processing
This ASIC contains the following functions:
Video interface
Parallel-B interface
Serial/LocalTalk I/F board interface
Type-B interface card control
Control panel control
This ASIC contains the following functions:
BiRITech
This ASIC contains the following functions:
Parallel-C interface
These ROMs are code ROM.
These ROMs are font ROM.
This ROM is a local language ROM option for fonts.
This 1 K-bit EEPROM stores the following:
Model type
Printed page counter value
Toner life counter value
Jam counter value
SelecType setting
It provides working memory area for E05B17.
These DRAMs are used as the working area of the CPU:
input buffer, image buffer, etc.
EPL-N1200 Service Manual
Function
Rev. A