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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:
Summary of Contents for OL810e
Page 12: ...4 Universal Paper Cassette 5 High Capacity Second Paper Feeder 6 Power Envelope Feeder...
Page 20: ......
Page 52: ...Base unit...
Page 65: ...Partner Exchange BPX for any updates to this material http bpx okidata com...
Page 131: ...Page 68 Service Guide OL810e Chapter 6 Troubleshooting...
Page 134: ...Page 70 Service Guide OL810e Chapter 6 Troubleshooting 2 2 Paper feed jam...
Page 149: ...Page 84 Service Guide OL810e Chapter 6 Troubleshooting 8 White vertical belts or streaks...
Page 150: ......
Page 167: ...Page 99 Service Guide OL810e Chapter 7 Wiring Diagrams 7 3 Resistance Check...
Page 180: ...Page 106 Service Guide OL810e Chapter A RS 232 Interface Interface Parameter Setting...
Page 181: ......
Page 184: ...Connector pin arrangement 4 Signal Level LOW 0 V to 0 8 V HIGH 2 4 V to 5 0 V 5 Specifications...
Page 228: ...Paper Inlet Jam...