1000/1500 Service Manual
Appendix B
Table B2 lists the functions of the
MAIN-B board main elements.
Table B-2. Functions of
MAIN-B Board Main Elements
Element
Location
68000 CPU
The CPU, which operates at 16.67 MHz, manages the video
controller operation.
This
contains the following functions:
. Interrupt control
. Address decoding
. Clock control
;::*83‘tandad
.
DRAM
(refresh control,
control)
. Image processing
.
interface
. Control panel
. Video interface
This
contains the following functions:
standard
●
Parallel
cell
. DRAM management, with the
. Video
signal switching
This ROM stores the following:
. Basic operating program
16M ROM
. PCU5
EPSON
emulation mode program
●
emulation mode program
. Fonts
This ROM is the GQ
chip option
(GQ mode program and GQ
8M ROM
fonts) or the local language ROM
(fonts) option (except
in
ActionLaser 1500).
This EEPROM stores the following:
. Model type
EEPROM
. Printed page counter value
Toner life counter value
setting
104, 10,
Standard DRAMs are
and IC104 only; other DRAMs are
DRAM
11, 12, 13,
options.
DRAMs
of the
- - “
-
-
17,
1 4 CPU: input buffer, image buffer, etc.
64K
SRAM
Working
area for E05A74
This changes the
signal level. (The ActionLaser
MA)(238
1000 does not have this
Rev. C
B-3
Содержание ActionLaser 1000
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Страница 147: ...Appendix B Service Manual o 0 R m43 Figure B 5 CI08 MAIN B Board Component Layout Back B 10 Rev C ...
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