Epson EPL-9000, Service Manual

Page: 76 / 162

OperatingPrinciples
Table 2-2 lists the functions of the MAIN board main elements.
Table 2-2. Functions of MAIN Board Main Elements
Location Function
MB86930 RISC
ICI
The CPU, which operates at 19.2 MHz, manages the video
CPU
controller operation.
This contains the functions:
●
Address decoding
. DRAM management (refresh control,
control)
This contains the functions:
●
video signal processing
.
●
EMGTech
This contains the functions:
●
Video interface
●
interface
●
interface
interface
. LocalTalk module control
. Type-B interface card control
Control panel control
8M ROMs or
IC1615 or
These ROMs are code ROM.
four
4M
ROMs
,
Two ROMs 30
These ROMs are font ROM.
BM ROM
This ROM is language ROM (fonts) option.
This stores the
. Model type
. Printed page counter value
. Toner life counter value
. Jam counter value
●
setting
25,26, These DRAMs are used as the working area of the CPU:
27
input buffer, image buffer, etc.
This changes the signal level.
This changes the signal level.
2-24
Rev.