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故障手机用稳压电源供电时,电流表有多种反应,根据这些反应可大致判断手机故障范围。1.接稳压电源按开机键,电流表无反应,电流值为0A。一般是电源部分断路,或开机线上的二极管、三极管、线圈等元件断路。2.接稳压电源按开机键,电流表有反应,但电流值很小,故障部位一般在13MHz 时钟电路及 FLASH 和 RAW 等逻辑音频部分。3.接稳压电源按开机键,开机电流高于正常值,一般是稳压管、电源滤波电容、电流三极管等元件漏电。4.接稳压电源,电流表指示满格,说明手机电源短路,一般是功放及 B1+电路元件击穿。5.接稳压电源按开机键,能开机,但电流跳不到最大值。特别是拨号后按发射键,电流无变化,手机显示屏显示
Fault phone with a regulated power supply, the ammeter has a variety of reactions, based on these reactions can be roughly determine the scope of mobile phone failure. 1. Then press the power button, the ammeter does not respond, the current value is 0A. Generally part of the power circuit, or boot line of diodes, transistors, coils and other components open circuit. 2. Press the power button to press the power button, the ammeter has a reaction, but the current value is small, the fault location is generally in the 13MHz clock circuit and FLASH and RAW and other logical audio part. 3. Then press the power button press the power button, boot current is higher than the normal value, the regulator is generally, the power filter capacitor, current triode and other components leakage. 4. Then the regulator power supply, ammeter full indicator, indicating short-circuit power supply, power amplifier and circuit components B1 + breakdown. 5. Then press the power button press the power button, can boot, but the current jump to the maximum value. In particular, press the launch button after dialing, no change in current, the phone display shows