行扫描电路的调试与检修  

Adjustment and maintenance of the line scanning circuit

作　　者：王宏军[1] 郭占苗[1] 

机构地区：[1]西安航空职业技术学院电子工程系,陕西西安710089

出　　处：《电子设计工程》2011年第8期141-143,共3页Electronic Design Engineering

摘　　要：行扫描电路能够为行偏转线圈提供符合显示方式要求的行频锯齿波电流,行逆程变压器可以将行逆程期间产生的脉冲电压转换为显像管需要的阳极高压、加速极电压和聚焦极电压和视放电路所需要电压。这部分电路是整个显示管中除电源外,电压最高功率最大的电路,同时也是故障率最高最难维修的电路。通过采用对行扫描振荡级、激励级和输出级的工作过程理论分析,和用示波器对波形进行测量,以及用万用表对电压的测试,得出针对调试中可能出现故障的检修方法,最终达到对行扫描电路维修和调试的目的。The line scanning circuit can provide fit line frequency sawtooth current to horizontal yoke. Furthermore line back transformer can change pulse voltage to positive pole＇s high voltage, acceleration voltage and focus voltage which were provided to CRT, simultaneously,to video amplifier circuit. Except to power circuit, the line scanning circuit was the maximum voltage and power circuit,and it has the highest failure rate. This paper analyzed line oscillating stage, driving stage and output stage in detail, measured waveform by oscilloscope, and tested voltage with the muhimeter. Finally, repair methods about feasible breakdown are obtained in the debugging process for the line scanning circuit.

关 键 词：行扫描 行振荡 行激励 行输出 调试 检修 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]