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L15录像机没有给出前置分配混合放大器的资料,给广大维修工作者增添了困难。本文弥补了原资料的不足,不仅给出了放大器的电路,还分析了原理及常见故障和检修办法。前置分配混合放大器是L15录像机高频系统的一组件,包括输入回路,一级RF放大器,分配器,二级RF放大器,混合器等五部分,如图1所示,它主要为录像机调潜器和电视机提供放大的电视信号。从图1看出,天线来的电视信号,经输入回路,一级RF放大器,二分配器后分作两路:一路送至录像机调潜器,供记录用;另一路经二级RF放大器,混合器后,从射频插座输出。使得录像机在录制一套节目的同
L15 VCR did not give pre-assigned hybrid amplifier information, to the general maintenance workers added difficulties. This paper makes up for the lack of the original data, not only gives the amplifier circuit, but also analyzes the principle and common failures and overhauls. Front distribution hybrid amplifier L15 VCR is a high-frequency system components, including the input circuit, a RF amplifier, splitter, two RF amplifier, mixer and other five parts, as shown in Figure 1, it is mainly for the video recorder tune The TV and TV provide amplified television signals. Figure 1 shows that the antenna to the television signal, the input circuit, an RF amplifier, two split into two after the split: all the way to send the recorder to divert for recording; the other way through two RF amplifier, After mixer, output from RF socket. Makes the VTR record the same set of programs