Epson C11C605001 - DFX 9000 B/W Dot-matrix Printer, Руководство по обслуживанию

Страница: 75 / 161

Service Manual
Operating Principles
2.2
VIDEO CONTROLLER OPERATION
MAIN Board
The video controller section generates the video signals for the received data. The video controller
section is separate in the
MAIN board and the control panel.
Video Controller Section
, ------------- ------------------ . . . . . . . . . . .
,
,
.
●
.
,
,
,
,
0
.
,
.
,
,
,
,
,
,
.
,
,
,
,
,
.
,,
●
,,
,. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
,
,
.,
,
.
Control :
: Panel :
*
,
.
,
,
,
,
,
,
. . . . . . . . . . . .
Figure 2-35. Video Controller Section
2.2.1 MAIN Board Operation
Figure 2-36 shows a block diagram of the MAIN board. The MAIN board contains the
video controller, which consists of a 19.2 MHz, 32-bit bus) CPU, the
standard cells developed for this printer, DRAMs, ROM, and a
CPU
[ICI)
ROM
ROM
Option
15 or
Board
30)
1
A 1
I
T
1
ADDRESS
DATA
CONTROL
1 I 1 !
7)
Data
Address
Type B
Specific
Figure 2-36. MAIN Board Block Diagram
Local
Talk
Local
Talk
Rev.
2-23