Video Controller Operation; I C135Maln Board Operation; Figure 2-35. Video Controller Section - Epson C11C605001 - DFX 9000 B/W Dot-matrix Printer Service Manual

Service Manual
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 C135 MAIN board and the control panel.
2.2.1 C135 MAIN Board Operation
Figure 2-36 shows a block diagram of the C135 MAIN board. The C135 MAIN board contains the
video controller, which consists of a MB86930 (SPARKlite, 19.2 MHz, 32-bit bus) IW3C CPU, the
standard cells developed for this printer, DRAMs, ROM, and a 16K-bit EEPROM.
ROM 16M
CPU
[ICI)
1
1
Figure 2-36. C135 MAIN Board Block Diagram
Rev. A
Video Controller Section
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Figure 2-35. Video Controller Section

ROM 16M
1
T
I 1 !
Address
Operating Principles
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0
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Control
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: Panel :
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Option
Board
I
A 1
Type B
Specific
ADDRESS
DATA
CONTROL
Local
Talk
Local
Talk
2-23