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Service Guide OL810e
Chapter 2 Operation Description
2.1 Main Control Board
The main control board consists of a single chip CPU, a program ROM, a font ROM, four DRAMs, an
EEPROM, a host interface circuit, and a mechanism driving circuit.
(1) Single chip CPU
The single chip CPU is a custom CPU (32-bit internal bus, 32-bit external bus, 25.54-MHz clock, with input
frequency from a 12.27-MHz clock) which incorporates the RISC CPU and its peripheral devices, and has
the following functions:
Built-in device
Function
Chip select controller Control of ROM,
DRAM and I/O device Bus controller
DRAM controller
DMA controller
Transfer of image data from DRAM to video output port
Parallel interface controller
Control of Centronics parallel interface
Serial interface controller
Control of RS-232C serial interface
Video output port
Control of LED head
LED STB output port
Timer
Generation of various control timing
Monitoring of paper running and paper size
Serial I/O port
Control of operator panel, EEPROM, and options
I/O port
Input and output of sensor and motor signals
(2) Program and Font ROMs
The Program and Font ROMs store the equipment program and various types of fonts. EPROM or Mask
ROM is used as Program and Font ROMs. The mounting locations of these Program and Font ROMs vary
depending on the type of the ROMs (for the mounting location see Section 7.4).
(3) DRAM
The DRAM is a 2MB resident memory which is used as a buffer, that stores edited data, image data, DLL
data and macro data.
(4) EEPROM
1,024-bit Electrically Erasable PROM (EEPROM), is loaded with the following kinds of data:
Содержание OL810e
Страница 12: ...4 Universal Paper Cassette 5 High Capacity Second Paper Feeder 6 Power Envelope Feeder...
Страница 20: ......
Страница 52: ...Base unit...
Страница 65: ...Partner Exchange BPX for any updates to this material http bpx okidata com...
Страница 131: ...Page 68 Service Guide OL810e Chapter 6 Troubleshooting...
Страница 134: ...Page 70 Service Guide OL810e Chapter 6 Troubleshooting 2 2 Paper feed jam...
Страница 149: ...Page 84 Service Guide OL810e Chapter 6 Troubleshooting 8 White vertical belts or streaks...
Страница 150: ......
Страница 167: ...Page 99 Service Guide OL810e Chapter 7 Wiring Diagrams 7 3 Resistance Check...
Страница 180: ...Page 106 Service Guide OL810e Chapter A RS 232 Interface Interface Parameter Setting...
Страница 181: ......
Страница 184: ...Connector pin arrangement 4 Signal Level LOW 0 V to 0 8 V HIGH 2 4 V to 5 0 V 5 Specifications...
Страница 186: ...Page 108 Service Guide OL810e Chapter B Centronics Parallel Interface Interface Parameter Setting...
Страница 195: ...Transition to the operation mode occurs upon completion of resetting Engine maintenance mode menu system...
Страница 228: ...Paper Inlet Jam...