Fax Control Pcb - Kyocera Mita KM-3530 Service Manual

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2-2-1 Fax control PCB

Analog circuit

The fax control PCB (FCPCB) controls the overall fax operation.

To transmit a fax, image data scanned by the optical section of the copier is processed by the main PCB (MPCB) and then

sent to the fax control PCB (FCPCB). Received image data is first stored in the bitmap area of the SDRAM IC21 page by

page and compressed using the MH, MR or MMR method. The data is then stored in the image memory area of the SDRAM

IC21 and sent to the modem LSI IC81 to be modulated from digital signal to analog signal before it is sent to the telephone

line via the NCU PCB (NCUPCB).

To receive a fax, analog image data received from the telephone line via the NCU PCB (NCUPCB) is sent to the modem LSI

IC81 and, after demodulation into digital signals, stored in the image memory area of the SDRAM IC21. The image data is

then decompressed and converted into the bitmap area of the SDRAM IC21 page by page and sent to the ASIC IC71 for

resolution conversion and smoothing, and is passed to the main PCB (MPCB) as print image data.

Figure 2-2-1 Fax control PCB block diagram

Clock driver

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