论文部分内容阅读
D系列四片机彩色电视机,是国内早期从日本引进生产的优选机型,生产厂家众多,社会拥有量很大。目前,这类机器都已逐渐步入故障期,本文根据平常对该类机器的检修经验,以飞跃56D1彩色电视机为主,以其它类似机型为辅,系统介绍各种故障的分析检修方法。一、高频调谐器的故障检修高频调谐电路部分的简略图如图1所示。高频调谐器是电视机通道信号的入口,若出现故障,将导致整机不能正常工作,常见的故障现象有以下几类: (一)某个频段无信号,其它频段正常根据故障现象分析,电视机只是某个频段无信号,
D series of four-color TV sets, is the early introduction of production from Japan preferred models, many manufacturers, the community has a lot. At present, these machines have gradually entered the failure period, this article according to the usual experience of maintenance of such machines to leap 56D1 color TV-based, supplemented by other similar models, the system introduced a variety of fault analysis and repair methods . First, the high-frequency tuner troubleshooting High-frequency tuning circuit schematic diagram shown in Figure 1. High-frequency tuner is the entrance of television channel signal, if there is a fault, it will cause the whole machine to not work normally. The common fault phenomenon has the following types: (1) No signal in certain frequency band, other frequency bands are normal According to the fault phenomenon analysis, TV is only a band no signal,