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例1 机型:VIP—1000(VCP—777) 故障现象:重放图像正常,伴音发闷,音量也较正常时小。分析检修:据用户反映,该故障已经多次多处修理,但均未修复,原因是音频磁头磨损,配不到原件”。笔者仔细观察了音控磁头,发现磨痕并不太明显。于是对其进行了清洗、消磁,但效果还是不佳,又反复调整其方位锣丝,仍不见好转,于是怀疑音频电路有故障,并检查了以IC_(401)为主的音频电路,经电阻电压测量后(正常)仍未找出故障所在,此时笔者分析,音声发闷,是因电路高频特性不佳,这说明有信号通道中可能存一高
Example 1 Model: VIP-1000 (VCP-777) Symptom: The playback image is normal, sound boring, the volume is smaller than normal. Analysis and maintenance: According to the user, the fault has been repeatedly repaired many times, but they are not repaired, because the audio head wear, with less than the original. "I carefully observed the audio control head, found traces of wear is not too obvious. Its cleaning, degaussing, but the effect is still not good, but also repeatedly adjust its position gongs, still no improvement, so I suspect the audio circuit is faulty, and check the IC_ (401) based audio circuit, the resistance voltage After measurement (normal) has not yet found the fault, this time I analyzed, sound dull, because of poor high-frequency circuit characteristics, indicating that there may be a signal channel to save a high