一、送、受话器的修理1.炭粒式送话器有些电话机使用的炭粒送话器,常见故障是杂音增大,通话质量明显下降。检查时可将送话器从手柄中取出,握在手中,在耳边摇动,正常情况应能听到炭粒的“沙沙”声,说明炭粒的活性较好。若用 R×100Ω档欧姆表测量,阻值与送话器的位置放置有关,且阻值不定,在1～10 kΩ内变化。若对着送话器讲话或吹风,欧姆表的表针位置有明显变化,则说明送话器没问题。如果听不到“沙沙”声或“沙沙”声不明显,则炭粒可能被电流烧结或受潮后粘结,这时对送话器吹风或讲话,万用表指针摆动不明显。也可以用好的电话机手柄中的送话器来比较。如果因大电流烧结而使送话器炭粒失效,则这种送话器不能继续使用。有的电话机离交换机很近,通过 First, to send, receiver repair 1. Charcoal microphone Some phones use carbon particle microphone, the common fault is increased noise, call quality dropped significantly. Check the microphone can be removed from the handle, holding in your hand, shaking in the ear, under normal circumstances should be able to hear the carbon particles of the “rustle” sound, indicating the better activity of carbon particles. If using R × 100Ω ohmmeter measurement, the resistance is related to the placement of the microphone, and the value of resistance varies from 1 to 10 kΩ. If you speak to the microphone or hair, ohm table needle position has changed significantly, then there is no problem with the microphone. If you can not hear the “rustling” or “rustling” sound is not obvious, then the carbon particles may be current sintering or moisture bonding, then the microphone hair or speech, multimeter pointer swing is not obvious. You can also use a good phone handle microphone to compare. This microphone can not be used any more if it fails to ignite the microphone due to high current sintering. Some telephones are close to the switch and pass