Panasonic KX-TG8421FXB Service Manual

Contents

87KX-TG8421FXB/KX-TG8421FXN/KX-TGA840FXB/KX-TGA840FXN+1.8VCN4Headset Jack14235100kR32MIC-MIC+RECEIVER+-SP-PHONE_SPEAKER+-R100( )D10pC71D10pC83D10pC72D10pC73D10pC113C128( )C108( ) C82K470pK0.1uC172L7210kR4010kR41GNDBATTERYR152( )GNDGND0R2080R209C111( )C109( )10kR42D3( )21D4( ) 21C77( )C76( )VREFmVREFm1VREFmVREFmGNDGNDGND GNDGND GNDVREFmGNDRE264K1A02A13A24GND5 SDA6 SCL7 WP8 VCCCP+2.5VC10K2.2uL73( )0R33100kR34100R306VREFm1C86K10uD21D2210L74K1000pC127 R307( )GNDVREFm1 VREFmVREFmVREFm GNDGNDR309( ) R310( )L9VREFm1VREFm1VREFm VREFmK0.1uC33K1000pC152GNDGNDANT_TPGNDK1uC188GNDGNDGNDGNDGNDL3( )R308L71( )K1000pC110K1000pC185GND100nC808220R8061PSET 2VCCS 3PI 4PIX7 PSEL8 POX9 PO10 VCC11GND5PRAMP6 PAON1kR803GNDRXONGND10pC819PON GND10pC809GNDPSELRF_RXp220R8071kR804VDD_PADRVTXONGND10pC81210pC827TXpGNDGNDGNDGND47R805TXnGND GND10pC825RF_RXnGND3.3nC814GNDGNDGND10pC811GNDBATTERYD13D14GNDGNDD10pC701.8V2pC8042pC8021.5pC80327nL801C837NCGNDDA801123SHIELD1 234563pC861L804NCGNDGND2pC8260.7pC82010pC822CARBON_CL1MIC AP11210pC8603.6nL8023.6nL8031.6pC8101.6pC8133.3pC8053.3pC8060.5pC862C8594pD10pC864 D10pC863GNDGNDR808( )GND100R8020.5pC834R7482R7382D10pC74D10pC75VREFmVREFm680R801VREFmMIChLSRpLSRpLSRnMICpMICnHEADSET_DET(MAX500mA)BalunBPFPre-matchingW 0.15mmL 5.0mm1st layerW 0.15mmL 5.0mm1st layerW 0.125mmL 7.6mmGap 0.125mm1st layerW 0.15mmL 20+/-2mm3rd layerW 0.15mmL 20+/-2mm3rd layerW 0.15mmL 20+/-1mm3rd layerW 0.15mmL 4.0mm x21st layerTest Pattarn for CarbonShield CaseIC3IC801(1)(2)(3)(4)(5)(7)(6)(9)(10)(11)(12)(13)(14)(8)KX-TGA840 SCHEMATIC DIAGRAM (Handset_Main)NC: No Components1.8VRX_RFTX_RFTX _AFRX-AF (Handset)Sp-phone RX/Beep