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[例1]故障现象 每次开机约两分钟后图像无规则上下跳动,其它功能正常。 分析与检修 调场同步可调电阻R407,能暂时同步,说明场振荡频率正确,估计是场振荡电路中某元件的热稳定性差。该机场频电路中由IC501(AN5435)与(13)脚外接RC元件组成锯齿波形成电路,查IC501(15)脚电压为12V(正常);测量(13)脚电压在6V上下波动很大(正常为6V)。怀疑是锯齿波形成电容C404(3.3μF/16V)热稳定性差。用一只3.3μF/16V钽电容更换后试机,故障排除。
[Example 1] Symptom Images appear irregularly up and down about two minutes after each power-on, and other functions are normal. Analysis and overhaul adjustable field adjustable synchronous resistor R407, can be temporarily synchronized, indicating the correct field oscillation frequency, it is estimated that the field oscillation circuit in a component of poor thermal stability. The airport frequency circuit consists of IC501 (AN5435) and (13) external RC components form a sawtooth waveform circuit, check IC501 (15) pin voltage is 12V (normal); measurement (13) pin voltage fluctuations in the 6V up and down Normal 6V). It is suspected that the sawtooth wave forms capacitor C404 (3.3μF / 16V) with poor thermal stability. With a 3.3μF / 16V tantalum capacitor replacement test machine, troubleshooting.