Fax Control Pcb - Kyocera Mita KM-2530 Service Manual

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2-2-1 Fax control PCB

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 U21/U22 page

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

the SDRAM U21/U22 and sent to the modem LSI U81 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

U81 and, after demodulation into digital signals, stored in the image memory area of the SDRAM U21/U22. The image data

is then decompressed and converted into the bitmap area of the SDRAM U21/U22 page by page and sent to the ASIC U71

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

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