Kyocera KM-4230 Service Manual page 146

The following is a description of memory copy PCB 1 (MCPCB1). Memory copy PCB 2
(MCPCB2) is identical to memory copy PCB 1 (MCPCB1).
Memory copy PCB 1 (MCPCB1) consists of CPU U17, ASIC U16, SRAMs U4 and U11,
DRAMs U13, U14, U15, U18, U19 and U20, EPROM U1, and CODECs U25 and U26.
The memory copy PCB mainly serves to read images from the scanner based on the
control signals from the main PCB (MPCB), and output the images to the engine (the
component where printing to paper and driving of mechanisms are executed). It also
performs editing operations such as image rotation, image summary and image
synthesizing.
Since the original scanning speed of the scanner and the printing speed of the engine
(the component where printing to paper and driving of mechanisms are executed) are
different, and their operations not synchronized, memory copy PCB 1 (MCPCB1) also
serves as a buffer to deal with the speed and timing differences between them.
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