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例13 长虹2188彩电故障现象:屡烧开关管与VD826 分析与检修:该机初始故障为“三无”。经查,保险熔断,调整管VQ83被击穿,更换上述元件后,机器恢复正常。考虑到调整管可能是因其c极与e极之间的反峰吸收网络不良而引起击穿的,又更换了C823和C824,然后才交付使用。半月后,又出现“三无”现象,经查,又是保险熔断、VQ83和VD826击穿,更换后,机器又能正常收看。同一故障反复出现,说明电路中还存在隐患之处。隐患可能存在于下述电路:(1)300 V
Example 13 Changhong 2188 TV failure phenomenon: repeated burning switch and VD826 Analysis and Maintenance: The aircraft initial fault as “three noes.” The investigation, the insurance fuse, adjust the tube VQ83 breakdown, the replacement of the above components, the machine returned to normal. Considering that the pass transistor may have broken down due to the poor anti-peak absorption network between the c and e poles, the C823 and C824 were replaced before being delivered. Half a month later, there was a “three noes” phenomenon, the investigation, but also insurance fuse, VQ83 and VD826 breakdown, after replacement, the machine can normally watch. The same fault repeatedly appears, indicating that there are hidden dangers in the circuit. The hidden danger may exist in the following circuit: (1) 300V