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故障现象(18):开机,图像无彩色,调色饱和度屏幕显示正常。检修:NQ501(TA7698AP)内部消色电路不良。更换NQ501。故障现象(19):接收NTSC制信号时,图像无彩色。
Symptom (18): boot, no color image, color saturation screen appears normal. Overhaul: NQ501 (TA7698AP) Defective internal achromatic circuit. Replace NQ501. Symptom (19): When receiving NTSC signal, the picture has no color.