LG KU250 Service Manual - Page 88
Checking PAM Block
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4. TROUBLE SHOOTING 4.7.4 Checking PAM Block TP1. GSM_PA_RAMP : Power Amp Gain Control. typically, 0.2V < Vramp < 1.6V TP2. GSM_PA_EN : Power Amp Enable (Power ON : higher than 1.25V , Power OFF : lower than 0.4V) TP3. GSM_PA_BAND : Power Amp Band Selection Control (GSM Mode : -0.2V < VBS < 0.4V , DCS/PCS Mode : 1.25V < VBS < 3.0V) TP4. +VPWR : PAM Supply Voltage Vcc higher than 3.0V TP1 TP4 TP2 TP3 Rev.D 4 L403 p 1.5nH L116 10nH C438 100p C138 NA C139 68p 100ohm R107 GSM_PA_RAMP C123 0.01u C121 33u TP4 +VPWR EGSM TP1 C134 0.01u TP3 C136 0.01u VAPC 20 VBATT 17 VCC1B 6 VCC1A 2 15 DCS_PCS_OUT 3 DCS_PCS_IN U101 11 EGSM_OUT EGSM_IN 4 19 RSVD_GND ENABLE 18 21 P_GND SKY77318 BS 1 FL1 R113 100ohm C149 15p GSM_PA_EN EFC 7 GND1 8 GND2 GND4 GND3 10 GND5 12 GND6 13 GND7 GND8 GND9 16 14 9 TP2 5 R117 100ohm C153 15p GSM_PA_BAND Schematic of GSM PAM Block - 89 -
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