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 sent, through the IOGA5, to the LED head in sync with the print operation.

(2) G3 Send Mode (MH/MR/MMR Codes)

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 converted to MH/MR/MMR codes by firmware, then written into the external DRAM again. The converted data is sent to the modem board to

be modulated. The data modulated by the modem is sent to the NCU board by the Send signal "S." The data sent to the NCU board is amplified there, then

output to the public line.

(3) G3 Receive Mode (MH/MR/MMR Codes)

The signal input from the public line to the NCU board is amplified, input to the modem board as an R signal, demodulated by the modem, and written into the

DRAM on the MCNT PCB. MH/MR/MMR-code data is converted to image data by firmware and written into the DRAM again. The written data is sent, through the

IOGA5, to the LED head in sync with the print operation.

(4) G3 Receive Mode (JBIG Code)

The signal input from the public line to the NCU board is amplified, input to the modem board as an R signal, demodulated by the modem, and written into the

DRAM on the MCNT PCB. JBIG-code data is sent to the JBIG control LSI chip to be converted to image data. Then, the image data is written into the DRAM. The

written data is sent, through the IOGA5, to the LED head in sync with the print operation.

(5) G3 Send Mode (JBIG Code)

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 converted to MH/MR/MMR codes by firmware, then written into the external DRAM again. The converted data is sent to the JBIG control LSI

chip to be converted to JBIG codes. Next, the JBIG-code data is sent to the modem board to be modulated. The data modu-lated by the modem is sent to the

NCU board by the Send signal "S." The data sent to the NCU board is amplified there, then output to the public line.

(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

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