3JG
2-2-1
2-2-1 Fax control PWB
Data bus
FCPWB
Address bus
READY
CPUCLK
MDMRESn
RESET
32bit
16bit
16bit
NCU
PWB
Osicllator
(U41)
+5.0V
+3.3V
RESET IC
(U73)
U32
DAA
LINE1
LINE2
TELSEL
EARTH
DCCONT
Analog
I/F
U52
RESETn
Speaker
control
RESETn
U61
SDRAM
U31
32MBx128Mbitx2
(Upper/Lower)
ASIC
(U21)
CPU
(U11)
200MHz
MFP
Main
PWB
MODEM
(U51)
Flash ROM
(Upper/Lower)
8MBx64Mbitx2
U33
U34
Figure 2-2-1 Fax control PWB block diagram
The fax control PWB (FCPWB) controls the overall fax operation.
To transmit a fax, image data scanned by the optical section of the MFP is processed by the main PWB and then sent to the
fax control PWB (FCPWB). Received image data is first stored in the bitmap area of the SDRAM U31/U32 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 Flash ROM
U33/U34and sent to the modem LSI U51 to be modulated from digital signal to analog signal before it is sent to the
telephone line via the NCU PWB (NCUPWB).
To receive a fax, analog image data received from the telephone line via the NCU PWB (NCUPWB) is sent to the modem
LSI U51 and, after demodulation into digital signals, stored in the image memory area of the Flash ROM U33/U34. The
image data is then decompressed and converted into the bitmap area of the SDRAM U31/U32 page by page and sent to the
ASIC U21 for resolution conversion and smoothing, and is passed to the main PWB as print image data.
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