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不开机是爱立信388/398系列手机易出现的故障,其开机电路如图1所示。接上电源,按开机键,开机二极管V702导通,电子开关V700④脚为低电平,V700导通,①脚输出电压SWDC送电源集成电路31084T、31085的③脚。稳压管V450、V451和V452输出3.75V电源供给射频电路。V760、V770和V780输
Not boot is Ericsson 388/398 series phones prone to failure, the boot circuit shown in Figure 1. Connect the power, press the power button, turn on the diode V702 turn on, the electronic switch V700 ④ foot is low, V700 is turned on, ① pin output voltage SWDC power supply integrated circuits 31084T, 31085 ③ feet. Regulators V450, V451 and V452 output 3.75V power supply RF circuit. V760, V770 and V780 lose