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厦华牌XT-5101型彩色电视机是由厦门组装的51cm(20英寸)彩色电视机,它的社会拥有量较大。本文介绍两则常见故障的维修实例,供维修人员参考。故障实例1: 开机或转换频道时,能正常收看。但在自动选台时,电路却突然保护,出现“三无”现象。待关机后,再启动电路又能正常收看,如再自动选台,又重复以上现象。故障判断上述现象多数为保护电路动作所致。保护电路在机内出现异常高压或大电流时动作。若保护电路过于灵敏,也会出现电路工作在正常允许范围内的最高电压或电流极限值时,保护电路过早动作,从而产生以上故障现象。
The Xoceco XT-5101 color TV set is a 51cm (20 inch) color TV set assembled by Xiamen. It has a large social ownership. This article describes two common examples of fault repair for maintenance personnel reference. Fault Example 1: boot or change the channel, you can watch normally. However, in the automatic channel selection, the circuit suddenly protected, there “three no” phenomenon. To be shut down, then start the circuit can watch normal, such as automatic station selection, repeat the above phenomenon. Failure to determine the majority of the above phenomena caused by the protection circuit. Protection circuit in the machine abnormal high voltage or high current action. If the protection circuit is too sensitive, the circuit will work in the normal allowable range of the maximum voltage or current limit, the protection circuit premature action, resulting in the above symptoms.