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频道选址开关和预选器配合,完成电视机节目选择功能。开关使用日久,造成簧片接触不良,使电视机出现图像不稳,无图无声等现象,严重影响节目的收看和学校的电化教学。 当电视机发现上述现象后,首先要区分出是机芯故障还是开关故障。开关故障的显著特点不是所有选址开关按动后都出现,而是只有一部分出现。否则就是机芯故障。对纯因开关不良造成的故障,自己完全可以动手修理。 1.打开机盖。若需取出机芯板的要详细记录各插头位置。
Channel location switches and preselection with the completion of the TV program selection function. Switch is used for a long time, resulting in reed poor contact, so that the TV picture instability, no picture silent phenomenon, seriously affecting the program’s viewing and the teaching of the school. When the TV found the above phenomenon, we must first distinguish whether the movement or switch failure. Notable features of switch failure Not all siting switches appear after pressing, but only part of them appears. Otherwise it is the movement failure. Simply because of poor switching caused by failure, they can completely repair hands. 1. Open the cover. If you need to remove the movement plate to record the location of each plug in detail.