LG KM710 Service Manual - Page 43

4. Trouble Shooting 4.1.2.2 Power Amplifier Module (RPF09036B) Select the RX / TX path and amplifier the power. C427 U401 C425 C431 U402 ] Part Description Front End Module Switch Control C431 : VRAMP C427 : BAND_SELECT C425 : TX_ON C422 : Vc_DCSPCS_Tx C424 : Vc_EGSMGSM850_Tx C424 C422 Appli cation Mode GSM850 DCS1800 / PCS1900 GMSK EDGE GMSK EDGE Vtxon High High High High Vband High High Lo w Lo w ANT400 ANT401 C401 1000p C402 DNI KMS-518 SW400 C411 1.5p L411 8.2nH C413 1000p G1 A C G2 100nH L408 FL400 ESHS-C090SR GND5 GSM18001900_TX 16 11 GND4 GSM900_TX 15 13 14 GND3 GND2 GSM1900_RX2 9 6 GND1 GSM1900_RX1 7 5 GSM1800_RX2 4 GSM1800_RX1 3 VC2 GSM900_RX2 10 2 VC1 GSM900_RX1 12 1 ANT 8 C421 22p C422 56p C424 15p C428 82p C429 1.2p L409 8.2nH C430 DNI VBAT C432 10u C433 0.01u C434 22p C436 82p L410 C437 1.8nH 1.2p C438 DNI 49 PGND25 PGND24 48 PGND23 47 PGND22 46 PGND21 45 44 PGND20 PGND19 43 PGND18 42 PGND17 41 40 PGND16 39 PGND15 38 PGND14 37 PGND13 COUPLER_OUT_XCS 20 GND4 21 GND3 22 GND2 23 GND1 24 L402 4.7nH L404 3.9nH C412 3p C414 3p C416 3.3p C418 3.3p 4.7nH L405 4.7nH L407 L406 18nH 120 R405 51 R403 120 R407 100ohm R404 R406 68 100ohm R408 C_VCCRF VCC_SYN C403 0.01u C409 22p C400 0.01u C406 3.9p C407 0.1u C404 3.9p VCCAD GNDBBAD VCCBB A6 GNDRFVCO B6 A5 C5 VCCRFVCO QOUTB_QINB B5 QOUT_QIN C4 B4 A4 IOUT_IIN IOUTB_IINB GNDRFLO C3 VCCRFLO A3 VCCMIX B3 D3 B2 A2 VCCLNA GNDMIX PCSGND A1 B1 PCSLNAI C2 C1 PCSLNAIB PCSDCSGND D1 DCSLNAI D2 DCSLNAIB E1 DCSG90GND G90LNAI F1 G90LNAIB E2 G90G85GND G1 H1 F2 G85LNAI G85LNAIB G85GND G2 GNDLNA_TX1 H2 TXON E3 J2 GNDDMIXIN J1 DMIXIN DMIXINB U401 R2A60167BG C6 A7 VCCRFSYN C7 GNDRFSYN B7 CAFC A8 VCCVCXOR VCXTCXO BT_CLK C405 33nF C408 68p B8 XOP A9 X400 FA-23H 4 3 1 2 R401 47K 26MHz B9 XON C8 GNDVCXO_OR VOUTEF2 D7 C9 VCCVCXO D8 VOUTEF1 D9 VCCLOGIC2 GNDLOGIC E7 CLOGIC1 F7 VCCLOGIC1 E9 STROBE SYSCLK RXTXDATA E8 F8 F9 RXTXEN G7 TEST1 G6 CTRLEN G9 G8 CTRLDATA H9 CTRLCLK C417 0.1u 0.01u C419 VRIO L403 8.2nH U400 1 _OE 2A 3 GND VCC 5 4 Y SN74LVC1G125DRLR R402 1K C410 0.01u SYSCLK SLICER_IN C420 0.01u VCC_SYN VRIO DIGITALRF_DATA DIGITALRF_ENABLE DIGITALRF_RF_CS DIGITALRF_RF_DATA DIGITALRF_RF_CLK TXOUTD J8 SYSCLKEN J9 VBAT_IN VCCTXVCO GNDTXVCOD_B TXOUTG J6 GNDTXVCOD H6 VCCTX2 GNDTX2 H5 EAMPIB H4 LDO_CONT TXBAND TXMODE J4 VCCTX1 H3 FEMC1 G3 FEMC2 J3 VCCFEMC H7 J7 H8 G5 J5 F3 G4 C425 22p R409 100ohm C427 1000p C426 0.01u C423 0.01u SYSCLKEN C_VCCRF COUPLER_OUT_GSM 12 GND10 11 GND9 10 NC 9 GND8 8 PGND1 25 PGND2 26 PGND3 27 29 28 PGND4 PGND5 30 PGND6 31 33 32 PGND8 PGND7 PGND9 34 PGND10 35 PGND11 36 PGND12 13 14 POUT_GSM GND7 15 VLDO 16 VBAT1 17 VBAT2 18 GND5 19 POUT_XCS U402 RPF09036B PIN_GSM 7 TX_ON 6 VRAMP 5 GND6 VREG 4 3 BAND_SELECT 2 PIN_XCS 1 C431 33p C435 22p C_VCCRF PAM Circuit Diagram LGE Internal Use Only - 44 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes