Nokia NSE–3 SERIES Service Manual

Contents

Nokia NSE–3 SERIES Service Manual Manual pdf 15 page image

PAMSTechnical DocumentationNSE–3System ModulePage 3 – 9Original 11/97RF Connector ContactsCon-tactLineSymbolParameter Mini-mumTypical/ Nomi-nalMaxi-mumUnit / Notes1 EXT_ANTpExternal antenna connec-2 GND Im edance 50ohm tor,0 V DCSupply Voltages and Power ConsumtionConnector Line Symbol Minimum Typical /NominalMaximum/PeakUnit / NotesCharging VIN 7.1 8.4 9.3 V/ Travel charger,ACP–9Charging VIN 7.25 7.6 16.0 V/ Travel charger.ACP–7Charging I / VIN 720 800 850 mA/ Travel char-ger, ACP–9Charging I / VIN 320 370 420 mA/ Travel char-ger, ACP–7Functional DescriptionThe transceiver electronics consist of the Radio Module ie. RF + Systemblocks, the UI PCB, the display module and audio components. The key-pad and the display module are connected to the Radio Module with aconnectors. System blocks and RF blocks are interconnected with PCBwiring. The Transceiver is connected to accessories via a bottom systemconnector with charging and accessory control.The System blocks provide the MCU, DSP and Logic control functions inMAD ASIC, external memories, audio processing and RF control hard-ware in COBBA ASIC. Power supply circuitry CCONT ASIC delivers oper-ating voltages both for the System and the RF blocks.The RF block is designed for a handportable phone which operates in theGSM system. The purpose of the RF block is to receive and demodulatethe radio frequency signal from the base station and to transmit a modu-lated RF signal to the base station. The PLUSSA ASIC is used for VHFand PLL functions. The CRFU ASIC is used at the front end.