Epson EPL-N1200 Service Manual - Page 77

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

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Operating Principles EPL-N1200 Service Manual Table 2-2 lists the functions of the C205 MAIN board main elements. Table 2-2. Functions of C205 MAIN Board Main Elements Element Location 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 DRAM IC17 IC18,19,20, 21 Function 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. 2-18 Rev. A

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Table 2-2 lists the functions of the C205 MAIN board main elements.
Table 2-2. Functions of C205 MAIN Board Main Elements
Element
Location
Function
MB86930 RISC CPU
IC15
The CPU, which operates at 20 MHz, manages the video
controller operation.
E05A91 ASIC
IC1
This ASIC contains the following functions:
Address decoding
DRAM management (refresh control,
RAS/CAS control)
E05B31 ASIC
IC38
This ASIC contains the following functions:
Video signal processing
E05A93 ASIC
IC11
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
E05B17 ASIC
IC16
This ASIC contains the following functions:
BiRITech
E05B27 ASIC
IC43
This ASIC contains the following functions:
Parallel-C interface
Two 8 M-bit ROMs
IC12,13
These ROMs are code ROM.
Two 8M-bit ROMs
IC32,33
These ROMs are font ROM.
Option
8M-Bit ROM
IC6
This ROM is a local language ROM option for fonts.
EEPROM
IC5
This 1 K-bit EEPROM stores the following:
Model type
Printed page counter value
Toner life counter value
Jam counter value
SelecType setting
SRAM
IC17
It provides working memory area for E05B17.
DRAM
IC18,19,20,
21
These DRAMs are used as the working area of the CPU:
input buffer, image buffer, etc.
Operating Principles
EPL-N1200 Service Manual
2-18
Rev. A