Samsung SF3000 Service Manual

Also see for SF3000: Operator's guide

Contents

Pin No. KS32C6500 ATLAS used pin Pin Description136 GIP3 GIP3 TX INT137 GIP4 GIP4 _XDREQ (SDIP4)138 GOP2 GOP2 _XDACK (SDIP4)139 LFIA0 LFIA0 LF MOTOR PHASE CONTROL140 LFPHA LFEN LF MOTOR ENABLE141 LFIA1 LFIA1 LF MOTOR PHASE CONTROL142 LFIB0 LFIB0 LF MOTOR PHASE CONTROL143 LFPHB NOT-USED144 LFIB1 LFIB1 LF MOTOR PHASE CONTROL145 EEDATA NOT-USED146 EECLK NOT-USED147 GND9 GND9148 GOP3 GOP3 KEY CLICK149 GOP4 GOP4 POR CONTROL150 GOP8 NOT-USED151 GOP9 GOP9 SDIP4 CLK (30MHZ)152 GOP10 GOP10 _RESET OUT153 GOP11 NOT-USED154 GOP6 NOT-USED155 GOP7 NOT-USED156 VDDRTC VDDRTC RTC BACK-UP157 RXI RXI RTC CLK IN158 RXO RXO RTC CLK OUT159 _PHGA13 NOT-USED160 _PHGA12 NOT-USEDSamsung Electronics 5-9Circuit Description5-3. MemorySystem memory consists of 512 kB ROM, 32 kB SRAM and 1024 kB DRAM. All of SRAM is backed up. ROMand SRAM are selected by chip select lines, and data is accessed by the units position of the byte.5V power is applied to SRAM through VSB. This facsimile machine uses a Lithium battery for memory backup.A, 820 ohm resistor in series with the positive battery terminal is for battery protection.5-4. Modem and TX- and RX- Related CircuitsThese circuits control transmission between the internal MODEM and the LIU or a remote MODEM.The KS16117 is a single-chip fax-MODEM having features to detect and generate DTMF tones. TX OUT is theMODEM output port, and RX IN is the input port. /PORI is the Jupiter-2 signal which enables MODEMinitialization at system power on. D0 - D7 are data buses. RS0 - RS4 are internal register select signals whichdetermine the mode. /CS is the chip select signal, and /RD /WR are the read and write control signals. RLSDis used for v.24 interface-related signals and /IRQ is the MODEM interrupt.