Kyocera FS-1050 Service Manual - Page 78

4-3-2 Operation of circuit boards (1) Main board Operator panel I/F YC08 FPRSTN FPCLK FPDIR FPDAT YC07 APC I/F LONB VDFONSPL PDN OUTPEN Q01 Digital Transistor USBINT USBDP USBDN VBUL Q02 Digital Transistor EBA22, EBA10-1 EBCSN2, EBCSN3 EBOEN1, EBWEN1 CDWAITN, CDET1-2 CDRST YC03 USB I/F YC02 Option Memory card slot EDB31-16 YC06 Engine I/F SCKN, SO, PLGCLK SBSY, SI, SDIR, EGIRN, PDMASKN RSTN X02 X'tal (System) 25.0000 MHz U13 CXIN X03 X'tal (Video) 26.701882 MHz VXIN VXOUT X01 X'tal (USB) 48.0000 MHz 48MHZIN U11 YC04 Parallel I/F PNSELIN PNSTROBE, PNAUTOFD, PNNIT PNACK, PBUSY, PPERROR PSELECT, PFAULT PPDATA7-0 NSELIN PDATA7-0 EBA22-2 EBCSN0, EBCSN1 EBOEN0, EBWEN0 YS01 System DIMM Slot 1 (Code ROM) CPU U01 PowerPC 200 MHz RISC processor (Core ASIC) EBCSN0, EBOEN2 EBA21-1 U02 Font Mask ROM EBD31-16 EBA21-1 U03 EBCSN1, EBOEN2 OPRSTN OPRDY, DMAACKN, IORN, IOWN, EBCSN4 DMAREQ, OPACKN, OPIRN EBA15-1 YC01 API ROM EBD31-16 Socket Option I/F KUIO-LV (3.3 V) EBD31-16 EBIU Address bus EBIU Data bus EBD31-0 IICSCL IICSDA DQMLM, DQMLL DQMUU, DQMUM RASN, CASN, WEN, BA1, BA0, SDCLKE U07 IIC EEPROM SDCSN0 SDRAM Address bus SDA12-0 YS02 Option serial I/F YC05 DTR, RTS, TXD CTS, DSR, RXD RSSEL P1284DIR [Debugger connector] YC09 DBTXD DBRXD, DBCLK U9 3.3 V Regulator +5 V1 +3.3 V1 SDA12-0 SDCSN0 SDA12-0 U04 SDRAM SDD15-0 U05 SDRAM SDD31-16 SDA12-0 SDD31-0 SDCLK SDCSN1-2 SDCLK SDRAM Data bus SDD31-0 Option SDRAM DIMM Slot Figure 4-3-2 Main board circuit block diagram 4-19 FS-1050