Epson EPL-9000 Service Manual page 46

Service Manual
MAIN Board
1.5.1
The MAIN board is a video controller board. The primary functions of this board are
receiving print data from the host, generating the print image (video), and sending the print image
to the engine controller via the video interface. A 32-bit 19.2 MHz RISC CPU MB86930
(location: ICI) is used, and the following memory chips and custom
memory space.
Memory chips
Code ROM: four
Font ROM: two
DRAM
16K-bit
Custom
Others
RS-232C interface driver/receiver MAX202
interface driver/receiver MC34050
Reset
\
Rev.
6,14, 13) or two
mask ROM (M80A76:
25,26, 27)
I
CPU
- - - - - - -
I
I
' c '
I
Figure 1-17.
mask ROM
M80A77:
ROMs
I
/ \ \
- . - - - - - - - - -
1
:
- - - " - - -
DRAMs
MAIN Board
General Description
are assigned to the 4
15)
1-35