Service Manual
General Description
1.5.1
MAIN Board
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
are assigned to the 4
memory space.
Memory chips
Code ROM: four
6,14, 13) or two
mask ROM
15)
Font ROM: two
mask ROM (M80A76:
M80A77:
DRAM
25,26, 27)
16K-bit
■
Custom
Others
RS-232C interface driver/receiver MAX202
interface driver/receiver MC34050
Reset
\
ROMs
I
/ \ \
I
❑ ✌✏✌
CPU
- - - - - - - - . - - - - - - - - -
‘ c ’
- - - ” - - -
:
I
I
1
I
DRAMs
Figure 1-17.
MAIN Board
Rev.
1-35
Содержание C11C605001 - DFX 9000 B/W Dot-matrix Printer
Страница 1: ...EPSON TERMINAL PRINTER EPL 9000 SERVICE MANUAL EPSON ...
Страница 8: ...REVISION SHEET Revision Isaue Date Rev A I Augusl 5 1994 Revision Page I 1s issue I c c vii ...
Страница 117: ...Disassembly and Assemb y EPL UXM Service MAnual I T I Figure 3 50 Removing the ROS Unit 3 32 Rev A ...
Страница 118: ...Chapter 4 Adjustments No Adjustment is required in this product ...
Страница 161: ...EPSON ...