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故障现象:放像正常,记录状态下,观察监视屏上的节目信号源图像出现满幅彩色网纹干扰和彩色时淡时无,伴音变小;重放录制的节目,发现图像问样存在上述缺陷,且无伴音。分析与检修:该故障大多在按下记录健几分钟后出现,为“软”故障。根据现象分析,初步判断故障应出在与音频记录有关的电路上,在记录与重放状态下,分别测音频电路IC_(4601)(BA7766AS)与伴音录放控制有关的引脚端电压均止常,由于录制节目不但无伴音,而且原有的声音也没有抹掉,说明问题出在音
Symptoms: normal playback, recording state, observe the program on the monitor screen signal source appears full-color portrayal interference and color when no light, the sound becomes smaller; replay the recorded program and found that the image sample asked the existence of the above Defects, and no sound. Analysis and Overhaul: Most of the failures occurred after a few minutes of press-down, as a “soft” failure. According to the phenomenon analysis, the initial judgment of the fault should be on the circuit related to the audio recording. Under the recording and playback conditions, the voltage of the pin terminal associated with the audio recording and reproducing control is respectively measured by the IC 4601 (BA7766AS) , Not only because the recording program without sound, and the original sound is not erased, indicating that the problem is tone