Epson EPL-N1200, Service Manual

Page: 76 / 149

2.2 VIDEO CONTROLLER OPERATION
The video controller section generates the video signals for the received data. The video controller
section is separate in the C205 MAIN board and the control panel. The control panel is connected
to the engine controller board (PWB-A), but is controlled by the C205 MAIN board, which sends the
signals for the control panel through the engine controller board.
2.2.1 C205 MAIN Board Operation
Figure 2-27 shows a block diagram of the C205 MAIN board. The C205 MAIN board contains the
video controller, which consists of a MB86930 (SPARKlite, 20 MHz, 32-bit bus) RISC CPU, the
standard cells developed for this printer, RAMs, ROMs, and a EEPROM.
C205 MAIN Board
Video Controller Section
Engine
Controller
Board
(PWB-A)
Control
Panel
Figure 2-26. Video Controller Section
ROM 16M-Bits
(Code)
(IC32, 33)
ROM 16M-Bits
(Font)
(IC12, 13)
EEPROM
(IC5)
RAM SIMM
(CN1, CN6)
E05A91
(IC 1)
Serial/LT
Module
RS-232C, RS-422, or
LocalTalk
DRAMs
(IC 18, 19,
20, 21)
Address
Data
Control
E05A93
(IC11)
CPU
MB86930
(IC15)
ROM SIMM
(CN3)
E05B17
(IC16)
I/O Data
Address
Video I/F
(PWB-A) Parallel-B
Type B
I/F
Specific
I/F
74ACT1284
(C29,30,31)
Parallel-C
E05B27
(IC43)
SRAM
(IC17)
L. L. ROM
(IC6)
E05B31
(IC38)
: Option
PWB-A Board
Control Panel
Figure 2-27. C205 Main Board Block Diagram
EPL-N1200 Service Manual Operating Principles
Rev. A 2-17