電磁線圈端子不良
Poor solenoid terminal
有些喇叭內部電磁線圈漆包線端子接頭是鋁金屬鉚釘壓接連接的，非牢靠焊接連接，如果端頭漆包線上的絕緣漆處理不凈或鉚釘壓接不牢靠很容易產生虛接故障，導致喇叭工作不良。此種故障是喇叭質量原因，只能換件。
The terminal joints of the enamelled wire of some horn internal solenoid coils are crimped and connected by aluminum metal rivets, which are not firmly welded. If the insulating paint on the end enamelled wire is not treated cleanly or the rivets are not firmly crimped, it is easy to produce virtual connection fault, resulting in poor operation of the horn. This failure is the cause of horn quality and can only be replaced.
密封不嚴易受潮
The seal is not tight and easy to be damp
雖然混凝土攪拌車喇叭內部是密閉的，但如果密封不嚴清洗混凝土攪拌車時進入霧氣或內部空間空氣中有水蒸氣，水蒸氣很容易導致觸點受潮無法正常工作。
Although the interior of the horn of the concrete mixer truck is sealed, if the sealing is not tight, when cleaning the concrete mixer truck, it enters the fog or there is water vapor in the air of the internal space, which is easy to cause the contact damp and can not work normally.
觸點燒蝕

Contact ablation
如果長時間按喇叭易造成喇叭觸點燒蝕而產生阻抗，流過電磁線圈的電流減弱，混凝土攪拌車電磁吸力下降無法吸引銜鐵帶動膜片正常振動，導致發音沙啞甚至不響。但不斷按喇叭時，若瞬間強電流通過阻抗依然能正常工作，所以會時好時壞。
If you press the horn for a long time, it is easy to cause the horn contact ablation to produce impedance, the current flowing through the electromagnetic coil is weakened, the electromagnetic suction of the concrete mixer is reduced, and the armature cannot be attracted to drive the diaphragm to vibrate normally, resulting in hoarse pronunciation or even no sound. However, when the horn is continuously pressed, if the instantaneous strong current passes through the impedance, it can still work normally, so it will be good and bad from time to time.

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