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在我家附近,罗马尼亚产20英寸51cm天狼星牌黑日电视机有十几台,他的预选器损坏是无法修复的,并且高频头灵敏度非常低。我检修该机发现,只要把AGC电压稍作改动,就可以首先把原高频头和预选器焊下,把国产KP-12系列滚筒式高频头放置相应的位置,在AGC连线中串接一个10kΩ的可调电阻,把AGC电压降至3.2V,即可工作,12V电压不用改动,注:因底板带电属于热底板,所以高频头施扭必须采用全塑型,或用1:1隔离变压器。在本地使用,用车圈作的天线收看,2、7、8、9、11频头及黑龙江电视台6频道效果非常好,灵敏度高。
Near my home, Romania produced 20 inches 51cm Sirius Black Day TV has more than a dozen sets, his preselector damage can not be repaired, and the tuner sensitivity is very low. I overhaul the aircraft found that as long as the AGC voltage a little change, you can first of the original tuner and preselector welding, the domestic KP-12 series of drum-type tuner placed the corresponding position in the AGC connection string Then a 10kΩ adjustable resistance, the AGC voltage down to 3.2V, you can work, 12V voltage without change, Note: Due to the floor is hot subplate, so the tuner must adopt a full plastic torsion, or with 1: 1 isolation transformer. In the local use, made with a car antenna for viewing, 2,7,8,9,11 frequency head and Heilongjiang TV Channel 6 effect is very good, high sensitivity.