Epson EPL-N1200 Service Manual - Page 76

VIDEO CONTROLLER OPERATION, C205 MAIN Board Operation, Video Controller

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EPL-N1200 Service Manual Operating Principles 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. Video Controller Section C205 MAIN Board Engine Controller Board (PWB-A) Control Panel Figure 2-26. Video Controller Section 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. Parallel-C 74ACT1284 (C29,30,31) CPU MB86930 (IC15) ROM 16M-Bits ROM 16M-Bits (Code) (Font) (IC32, 33) (IC12, 13) E05B27 (IC43) E05A91 (IC 1) I/O Data Address E05B17 (IC16) E05B31 (IC38) E05A93 (IC11) Address Data Control EEPROM (IC5) Control Panel PWB-A Board DRAMs (IC 18, 19, 20, 21) SRAM (IC17) Serial/LT Module Type B I/F RAM SIMM (CN1, CN6) RS-232C, RS-422, or Specific LocalTalk I/F ROM SIMM (CN3) L. L. ROM (IC6) Video I/F Parallel-B (PWB-A) : Option Figure 2-27. C205 Main Board Block Diagram Rev. A 2-17

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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