Oki OKIFAX 5950, Maintenance Manual

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SIGNAL FLOW
OF5750/5950 Series January 2001 A2 - 22
(6) PC Print
The data input from the MCNT’s parallel I/F is input, through the IOGA5, to the DRAM
using DMA.
The input data is transferred to the DEC block in the IOGA5 using DMA.
In the DEC block, the data is expanded in the 1-line raster buffer in the IOGA5. Then,
the expanded data is sent to the video block in the IOGA5 in response to a 1-line syn-
chronous signal. In the video block, image processing is performed for printing and the
resultant data is transferred to the LED head.
(7) PC Scanner
The analog data output from the image sensor is input to the MCNT-PCB to be amplified
by the amplifier. The amplified analog data is input to the scanner controller. Next, the
analog data is converted to digital data by the built-in A/D converter. The digital data is
corrected by the internal correction function, transferring binary-coded data to the IOGA5
every eighth pixel. The data input to the IOGA5 is temporarily written into the external
DRAM (4 megabits x 16 bits). The written data is compressed to TIF data by firmware,
then written into the external DRAM again.
The written TIF data is sent to the MCNT’s parallel I/F through the IOGA5.