2.2 VIDEO CONTROLLER OPERATION
The video controller section generates the video signals for received data. The video controller
section is the C169 MAIN-B Board.
2.2.1 C169 MAIN-B Board Operation
Figure 2-26 shows a block diagram of video controller section of the C169 MAIN-B Board. The
C169 MAIN-B Board contains the video controller, which consists of a MB86933H (SPARKlite, 22.5
MHz, 32-bit bus) RISC CPU; the standard cells developed for this printer; DRAMs; ROM; and an
EEPROM.
C169 MAIN-B Board
Video Controller Section
Engine Controller Section
Figure 2-25. Video Controller Section
ROM 16M
(IC21, 22 or
IC13, 14,
15, 16)
EEPROM
(IC11)
E05A91
(IC 2)
Option
RS-232C
DRAMs
(IC 17, 18)
and
SIMM
ADDRESS
DATA
CONTROL
E05A93
(IC4)
CPU
MB86933H
(IC1)
ROM8
(IC12)
E05A92
(IC3)
I/O DATA
ADDRESS
Video I/F Parallel
I/F
Specific
I/F
LocalTalk
Figure 2-26. C169 MAIN-B Board Block Diagram
EPL-5500 Service Manual Operating Principles
Rev. B 2-17
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