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一、问题的提出笔者最近接修一台长虹C2143彩电,原来的故障是自动搜索不停台、不存储,图像一闪而过,根据检修经验判断是AFT电路故障,更换AFT中周并进行调整后,自动存台故障排除。可是根据用户的要求,更换增补高频头后,又出现了新的“自动搜索”故障:使用有线电视信号进行自动搜索存台时,L段和H段自动搜索存台正常,当搜索完H段最高端的第12号节目,搜索U段最低端第13号节目时,不再向前
First, the issue put forward I recently Changhong C2143 color TV repair, the original fault is automatically search non-stop Taiwan, not stored, the image flashed, according to the maintenance experience to determine the AFT circuit failure, replacement AFT Week and adjusted , Automatic deposit station troubleshooting. However, according to the user’s requirements, the replacement of the tuner after the emergence of a new “automatic search” failure: the use of cable signals automatically search deposit station, L and H segment automatic search deposit station normal, when the search H The most high-end section No. 12 program, search for the lowest section of the U section No. 13 program, no longer forward