电子计价秤内有三个工作电压 ,分别是 +５Ｖ、+１５Ｖ和 +３４Ｖ ,缺少任何一个产生的故障现象是不同的。１ 无显示、无声音。分析 :由于无 +５Ｖ电压输出 ,导致ＣＰＵ不工作、喇叭无声。维修 :电子计价秤的电源可以分为两个部分 ,直流部分在电路板上 ,交流部分在电路板外。首 Electronic pricing scale has three working voltage, respectively, +5 V, +15 V and +34 V, the lack of any one of the resulting failure phenomenon is different. 1 No display, no sound. Analysis: As no +5 V voltage output, resulting in CPU does not work, the speaker silent. Maintenance: Electronic pricing scale the power supply can be divided into two parts, the DC part of the circuit board, the exchange part of the circuit board. first