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故障现象:黄河HC47—Ⅲ光栅下部压缩约3cm 分析检修:这是黄河彩电常见故障,是典型的场扫描故障所致。测量场输出级中点电压稍微偏低;Q_(303)基极电压为1V(正常为0.6V),电压来自TA7698AP故怀疑该集成块性能不良。但更换后故障依旧。在进一步检查中无意发现光栅完全恢复正
Symptom: The lower part of the Yellow River HC47-Ⅲ grating compression about 3cm Analysis and Maintenance: This is the Yellow River TV common fault is caused by a typical field scan failure. The midpoint voltage of the output stage of the measurement field is slightly lower; Q_ (303) base voltage is 1V (normal is 0.6V) and the voltage is from TA7698AP, therefore it is suspected that the performance of the manifold is poor. But after the replacement of the fault still. In further examination, we did not intend to find the grating fully recovered