Xerox Phaser 6180MFP Service Manual page 128

Theory of Operation
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Scanner Controller Board
The Scanner Controller Board is the logic interface between the Scanner, Fax
Modem, MCU, and Image Processor boards. It's primary function is to control
and manage copy scan and fax image information. During the copy (scan or
fax) process, RGB data is collected by the scanhead and then converted by
the Scanner Controller Board into CMYK data. CMYK data is then routed
either to the MCU, I/P Board, or Fax Modem for proper management.
Fax Board
The Fax Board provides and interfaces between remote fax machines and the
Scanner Controller Board. Incoming fax data is received by the modem board
and is passed directly to the Scanner Controller Board for further processing.
Outgoing fax data is passed from the Scanner Controller Board at the
appropriate timing sequence when a clear transmission line has been
established.
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Phaser 6180MFP Multifunction Printer Service Manual