Samsung SGH-X400 Service Manual

Also see for SGH-X400: User manual Manual

Contents

SAMSUNG Proprietary-Contents may change without noticeSGH-X400 Flow Chart of Troubleshooting4-15This Document can not be used without Samsung's authorization9. EGSM transmitterU902change or resolderF1001 pin 12 :about 2~3 dBm?CN1001, C1003check&changeF1001pin13 : 2.8 V? U702check & changeU1001 pin9 :about 4~5dBm?F1001check & changeU1001pin4 : 3.7 V?NO NOYES YESYESNONO BATTERY, U102check & changeU1001pin 5 : 3V ?YESNOU1001 pin7about : -5dBm?YESYESU1001change orresolderNOU902pin14,23,26,32 :2.8V ?U102 pin39,C112change or resolderYESU902pin9,10,12,13:-20dBm ?U902pin5,6,7,8 :1.7V?YESU701changeNONOU1001change or resolderYESU903pin5,25,28: 3V ?NO U102 pin33,C111change or resolderNOU903pin 7 : 13MHz?Vp-p: 950mVYESU903pin9,10,11,1213: 3V?YESYESOSC801pin 3 : 13MHz?Vp-p : 950mVOSC801change or resolderU701check or changeOSC801pin 4 : 3V ? U102 pin33,C111change or resolderU903change or resolderNONOYESNOYESNOCONTINUS TX ON CONDITIONTX POWER DAC:500 CODE APPLIEDCH:62RBW : 100KHzVBW : 100KHzSPAN : 10MHzREF LEV. : 10dBmATT. : 20dBU102 Pin 37, C113check or resolder