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(一) 日立CTP-237D型故障现象开机工作正常,不知何时出现回扫线,光栅变暗,只有彩色信号,过一会儿能自动恢复正常,但又说不定何时会再出现故障。检查分析正常工作时,一切都正常,电路板受振也无变化,说明故障原因并不是虚焊或元件松动。有故障时,亮度调节失效,对比度调节对亮度有一点影响,色度调节有明显变化且影响亮度,无色信号(关掉
(A) Hitachi CTP-237D-type failure phenomenon Boot normal, I do not know when the retrace line, grating darkening, only the color signal, after a while can automatically return to normal, but maybe when there will be a recurrence of failure. Check analysis of normal work, everything is normal, the circuit board did not change the vibration, indicating that the cause of the malfunction is not Weld or loose components. In the event of a malfunction, the brightness adjustment fails, the contrast adjustment has a slight effect on the brightness, the chromaticity adjustment has a significant change and affects the brightness, the colorless signal