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故障现象 开机三无,有“吱吱”声。 分析与检修 故障现象表明负载过重。关机在路测行输出管壳对地正反向电阻正常,说明无直流短路。拔掉行场偏转线圈,开机仍无光,有“吱吱”声,说明偏转部分正常,断开行输出管集电极,接上60W灯泡作假负载,开机,灯亮,无“吱吱”声,测量开关电源111V主电压正常,且在100V—120V范围内稳定可调。由此说明开关电源正常。解除假负载,开机快速测行电流达500mA,插上偏转线圈后只增加50mA;用导线短接行推动变压器T501初级,将行振荡脉冲旁路,开机测行
Failure phenomenon boot three no “creak” sound. Analysis and troubleshooting shows that the load is too heavy. Shutdown at the road trip output tube shell to ground normal and reverse resistance, indicating no DC short circuit. Unplug the field deflection coil, the boot is still no light, a “creak” sound, deflection part of the normal, disconnect the output tube collector, connected to the 60W bulb for the load, boot, light, no “creak” The main voltage of the 111V switching power supply is normal, and it is stable and adjustable in the range of 100V-120V. This shows the switching power supply is normal. Remove the false load, fast boot line current up to 500mA, insert the deflection coil only increased 50mA; with a short line to promote the transformer T501 primary line, the line oscillation pulse bypass, boot line