Samsung SF-830 Service Manual

Also see for SF-830: Service manual User guide User guide

33-1Samsung ElectronicsCIRCUIT DESCRIPTIONRepair Manual3. Circuit Description3-1 Main PBA3-1-1 SUMMARYThe main circuit that consists of CPU, MFP controller (built-in 32bit RISC processor core: ARM7TDMI) including various I/Odevice drivers, system memory, scanner, printer, motor driver, PC I/F, and FAX transceiver controls the whole system. Theentire structure of the main circuit is as follows :OSC20 MHzPOWERON RESETMODEMCIP3OSC.(Video)45.3928 MHzLIUOSC.48 MHzUSBINTERFACE IC(UNICON)USBRTCPARALLELINTERFACEOPE PANELINTERFACEPROGRAMROM1MB x 4EASRAM256KDATA RAM(DRAM)8MB x 2EADATA RAM(DRAM)2MB x 2EAPLLReset & WDTGenerationARM7TDMICache 8KBROM/SRAM/FLASH ROMControl(4 Bank)I/OControl(5 Bank)CPU BUSInterface BlockGPIOSYSTEM BUSInterface Block[Arbiter]VISADCRAM : 512BUART(3 CH)InterruptControl(4 External)Timer(3 CH)ToneGeneratorEngineComm. I/FJBIGLRAM:1296BCXRAM:256BRAM512B+512BHPVCPPIPVCGEUEDO/FPMDRAMControl(4 Bank)MAMD RASCAS/CS,/RD,/WRA/D BUSIOCSPM-22 DMAC(2 CH)HCTIMCS/MIR0,/RD,/WRD0~D7A0~A4RST_OUT/RST_OUT/XDACK/XDREQ/SDIP CS/RD,/WRD0~D15A0~A5ID01 ~ ID15OD0 ~ OD15RA0 ~ RA15/CSCLOCK/RDNOR• Main B’D