Ricoh M281 Series, Service Manual

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Video Data Path
D255/D256 FAX OPTION 152 SM
Immediate Transmission
The base copier's scanner scans the original at the resolution agreed with the receiving terminal.
The BiCU video processes the data and transfers it to the FCU.
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When scanning a fax original, the BiCU uses the MTF, independent dot erase and
thresholding parameter settings programmed in the fax unit's scanner bit switches, not
the copier's SP modes.
Then the FCU stores the data in page memory, and compresses the data for transmission. The
NCU transmits the data to the line.
JBIG Transmission
Memory transmission: If the receiver has JBIG compression, the data goes from the DCR to the
QM-Coder. Then the NCU transmits the data to the line.
Immediate transmission: If the receiver has JBIG compression, the data goes from the page
memory to the QM-Coder. Then the NCU transmits the data to the line.
5.3.2 RECEPTION
First, the FCU stores the incoming data from either an analog line to the SAF memory. (The data
goes to the FACE3 at the same time, and is checked for error lines/frames.)
The FCU then decompresses the data and transfers it to page memory. If image rotation will be