Nokia NSE-6 SERIES Service Manual

Also see for NSE-6 SERIES: Technical documentation Tuning Instructions Disassembly & troubleshooting instructions

Contents

Nokia NSE-6 SERIES Service Manual Manual pdf 28 page image

PAMSTechnical DocumentationNSE–6System ModuleOriginal 08/98Page 3 – 16Functional DescriptionPower DistributionIn normal operation the baseband is powered from the phone‘s battery.The battery consists of three Nickel Metal Hydride cells. There is also apossibility to use batteries consisting of one Lithium–Ion cell. An externalcharger can be used for recharging the battery and supplying power tothe phone. The charger can be either a standard charger that can deliveraround 400 mA or so called performance charger, which can deliver sup-ply current up to 850 mA.The baseband contains components that control power distribution towhole phone excluding those parts that use continuous battery supply.The battery feeds power directly to following parts of the system: CCONT,power amplifier, and UI (buzzer, display, keyboard lights, IR and vibra).Figure below shows a block diagram of the power distribution.The power management circuit CHAPS provides protection agains over-voltages, charger failures and pirate chargers etc. that would otherwisecause damage to the phone.CCONT SIM+DC–jackCHAPSCOBBABATTERYPA SUPPLY RF SUPPLIESVBBBASEBANDVBATVCOBBA VSIMVBBCNTVRPWMVBATPWRONXPURXVINUIBACKUPRTCMEMORIESMADLIMVBB