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爱立信768/788系列手机是目前爱立信公司推出的主流机型,在市场上有较大的拥有量,下面将对该系列手机的常见故障进行分析。一、不开机这是768/788系列手机较易出现的故障,其有关电路如附图所示。未开机时V710、V520的控制脚第③脚通过R613接地,使其为低电平,稳压模块不工作。当开关“ON/OFF”闭合后,电池电压通过V611第②、③脚分别加到V710、V520第③脚上,使其为高电平而工作。V710产生
Ericsson 768/788 series phones are Ericsson’s mainstream models introduced in the market have a larger ownership, the following series of phones will be the common fault analysis. First, do not boot This is the 768/788 series phone more prone to failure, the circuit shown in the attached figure. V710, V520 control pin is not turned on when the third foot through R613 ground, so that it is low, the voltage regulator module does not work. When the switch “ON / OFF” is closed, the battery voltage is added to V710, V520 pin ③ by V611 ②, ③ feet, making it high. V710 generated