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一、故障现象:音量失控开机音量就达最大,电位器不起作用。检修发现只要印刷板往敷铜面略略弯曲,故障即消灭。由此判断故障应在电位器接地端的印刷孔或印刷线不通,最后发现敷铜层有裂缝,复一根细铜丝,焊上锡即修复。印刷裂缝在阻焊剂下目测不易发现,需用表测量。二、故障现象:拉线轴断裂找一根与拉线轴粗细相仿的尼龙或塑料杆。有一种组装塑料模型的零部件框架就很好,有一定的韧性。
First, the fault phenomenon: volume loss control volume up to the maximum, potentiometer does not work. Maintenance found that as long as the printing plate to the copper surface slightly bent, the fault is eliminated. Judging from the fault should be printed in the potentiometer or the printed circuit hole grounding barrier, and finally found that the copper layer cracks, complex a thin copper wire, the solder is repaired on the tin. Printing cracks in the solder mask visual hard to find, the need to measure the table. Second, the fault phenomenon: pull the spool to find a broken shaft thickness and thickness of nylon or plastic rod. There is an assembly of plastic parts model framework is very good, there is a certain degree of toughness.