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[例1]故障现象 加电无任何反应。 分析与检修 此寻呼机不开机,故障应出在解码板上。先重点检查电源供电电路。IC3为电源电路的核心元件,其作用是将1.5V的电池电压升压成3V的电压供CPU等电路使用。测IC3的输入端③脚有1.5V的电压,但输出端②脚无3V电压输出,由此判断为IC3损坏。更换IC3(型号RH5RC302A),故障排除。要说明的是,升压电感L损坏,也会造成不开机。 [例2]故障现象 接收正常,显示正常,但无振动功能。
[Example 1] Symptom Power-on without any reaction. Analysis and maintenance of this pager does not boot, the fault should be in the decoding board. First check the power supply circuit. IC3 power supply circuit core components, its role is to 1.5V battery voltage boost to 3V voltage for the CPU and other circuits. Test IC3 input pin ③ 1.5V voltage, but the output pin ② 3V voltage output, which is judged as IC3 damage. Replace IC3 (Model RH5RC302A), troubleshooting. It should be noted that the boost inductor L is damaged, can also cause not boot. [Example 2] Symptom Normal reception, display normal, but no vibration function.