Canon FAX-L260i Service Manual page 83

(1) The document is read by the contact sensor and converted to analog image data. After that, the analog image
data is sent to the SCNT board.
(2) The system controller IC converts analog image data from the contact sensor to digital image data.
(3) The system controller IC converts processed image data from serial data to parallel data, and writes them to the
DRAM.
(4) The MPU encodes image data in the DRAM using a soft codec, and rewrites the encoded data into the DRAM.
(5) The encoded image data passes through the centronics interface, is DMA forwarded and written to the G4
board's DRAM.
(6) The encoded image data is decoded to one-time data with the MPU's soft codec, and converted to a resolution
when transmitted. After this new raw image data is encoded with the transmission encoding method, it is read
into DRAM again.
(7) Image data is converted from parallel data to serial data by the multi-protocol serial controller IC, and HDLC
framed.
(8) With G4 transmission, image data passes through the ISDN interface IC, transformer and the ISDN line termi-
nal to the ISDN line. With G3 transmission, image data is modulated by the MODEM IC, and after being
converted to digital data by the PCM codec IC, passes through the ISDN interface IC, Transformer, and ISDN
terminal to the ISDN line.
FAX-L260i Chapter 2: Technical Reference
2-25