Board Descriptions
A - 8
OKIOFFICE 44 Serv. Man., P/N 59276801
A2.1
Signal Flow Explanation
Note : The OKIOFFICE 44 and OKIFAX 5000 series machines have very similar signal flows.
The differences are:
The one-line scanning processing speed of OKIFAX 5000 series is faster. The EXSEED (image
processing LSI) and SRAM (dark/light level correction data) have been added to the OKIFAX 5000
circuits.
Copy Mode
Figure A2.1.1 shows the picture signal route in local copy mode.
One-line picture data is transferred to A/D converter (analog/digital converter) from the scanning unit (CIS:
contact image sensor) as an analog data. After conversion from analog data to 6-bit digital data by A/D
converter, the picture data is sent to DRAM (line memory) via IOGA by DMA (Direct Memory Access).
Then the picture data is sent to IOGA again. Here, the picture data undergoes various kinds of picture
processings (IOGA and CPU), and is converted to two-level binary data (black and white). The one-line
binary data from IOGA is stored into DRAMs (page memory). When the data for one page has been stored
in the DRAMs, the data is read out from the DRAMs and sent to IOGA. The data is converted into a serial
data by the picture control of IOGA and transferred to the LED print head for printing as HDATA 0/1.
Writing of data into the page memory is also possible during the printing operation.
Summary of Contents for OKIOFFICE 44
Page 2: ...All specifications are subject to change without notice Service Manual OKIOFFICE 44 59276801...
Page 135: ...Disassembly 4 6 OKIOFFICE 44 Service Manual P N 59276801 Whole Unit Picture FX048 CP4 1 Fig 01...
Page 329: ...Illustrated Parts List D 6 OKIOFFICE 44 Service Manual P N 59276801 Section 2 Printer Unit...
Page 331: ...Illustrated Parts List D 8 OKIOFFICE 44 Service Manual P N 59276801 Section 3 Operator Panel...
Page 351: ...Illustrated Parts List D 28 OKIOFFICE 44 Service Manual P N 59276801 Section 12 Cables...
Page 357: ...Board Layout E 2 OKIOFFICE 44 Service Manual P N 59276801 MEM eps E 2 MEM PCB...
Page 358: ...Board Layout E 3 OKIOFFICE 44 Service Manual P N 59276801 TEL U eps E 3 TEL U PCB...
Page 359: ...Board Layout E 4 OKIOFFICE 44 Service Manual P N 59276801 Hook eps E 4 Hook PCB...
Page 388: ...OKIOFFICE 44 Service Manual Part Number 59276801 Printed in the USA...