Oki OF5300, Руководство по обслуживанию

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Page: 164
Service Manual for OF5300/5600
Chapter A Board Descriptions
Figure A2.2.1 shows the picture signal route in local copy mode.
One-line picture data is transferred to A/D converter (analog/digital) via operational amplifier 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 EXSEED (image processing LSI) and SRAM.
Here, the picture data undergoes various kinds of picture processings (EXSEED and SRAM), converted to
two-level binary data (black and white) and
then sent to IOGA (scanning control). The one-line binary picture data from IOGA is stored into DRAM.
When the data for one page has been stored in the DRAM, the data is read out from the DRAM 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. Writing of data into the page memory is also possible during the printing
operation.
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