论文部分内容阅读
故障现象:有伴音、无图像,满屏横纹,类似行不同步。分析与检修:检修发现磁鼓转速极快。检查鼓速控制电路ZC_6(BA6303),用人体感应信号注入⑥脚,磁鼓转速有所降低,说明信号处理电路基本正常,再从②、⑤脚注入信号,鼓速无变化。测②、③、④脚电压均偏离正常值(1.1V、1.2V、1.3V)。测这三个脚对地正反向电阻与正常值(正向:7.1kΩ、7.1Ω、6.2kΩ;反向:8.8kΩ、9.2kΩ、9kΩ)相差许多。查外接元件均正常,把集成块更换后故障排除。
Symptoms: a sound, no images, full screen stripes, similar to the line is not synchronized. Analysis and Maintenance: Overhaul found that the drum speed very fast. Check the drum speed control circuit ZC_6 (BA6303), with human induction signal injection ⑥ foot, drum speed decreased, indicating the basic normal signal processing circuit, then from ②, ⑤ foot into the signal, drum speed unchanged. Measure ②, ③, ④ foot voltage deviate from the normal value (1.1V, 1.2V, 1.3V). Measure the positive and negative resistance of these three feet on the ground and the normal value (forward: 7.1kΩ, 7.1Ω, 6.2kΩ; reverse: 8.8kΩ, 9.2kΩ, 9kΩ) a lot of difference. Check the external components are normal, the manifold replacement troubleshooting.