例一故障现象:伴音正常,出现水平一条亮线。分析与检修:根据故障现象,说明故障出在场扫描电路。场扫描电路由场振荡、锯齿波发生器、场推动、场输出等组成。其中只要有一个部分出问题都会出现上述故障。该机的场振荡、锯齿波发生器及场推动电路由IC201(TA7698)内的一部分完成。首先应检查场推动级和场输出级工作是否正常。方法是:用螺丝刀碰触 Example of a fault phenomenon: normal sound, there is a level of a bright line. Analysis and Maintenance: According to the fault phenomenon, indicating the failure of the field scanning circuit. Field scanning circuit by the field oscillation, sawtooth generator, field promotion, field output and other components. As long as there is a part of the problem will appear the above failure. The machine’s field oscillation, sawtooth generator and the field to promote the circuit by IC201 (TA7698) part of the completion. First of all should check the field to promote the level and field output level work is normal. Method is: touch with a screwdriver