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故障现象:一台金声牌JS-20A型小博士语言机,在翻录磁带时,磁带上原有的录音抹不净。分析检修:卸下带仓门认真观察,未见异常现象。但发现该机与一般录音机机械部分的设计有所不同。即当按下放音键时,抹音磁头不动(一般收录机是随着录放磁头一起动),只有按下录音键时,抹音磁头才落下紧贴着磁带。进一步仔细观察导带叉、录放磁头和抹音磁头,发现当按下录音键时,抹音磁头左边的录放音磁头的顶端抛物面和右边的导带叉均低于抹音磁头的
Symptoms: a gold sound JS-20A-type small Phillips language machine, when ripped tape, the original tape on the tape wipe net. Analysis and Maintenance: Remove the warehouse door carefully observed, no abnormal phenomenon. But found that the mechanical part of the machine and general recorder design is different. That is, when you press the play button, erase head does not move (usually tape recorders with the recording and playback head with a), only press the record button, the emerald head fell close to the tape. Further careful observation of the lead fork, record head and erase head, and found that when you press the record key, erase head left of the recording and playback head of the head of the parabolic head and the right side of the lead tape Fork below the head