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故障现象:接通录像机电源开关,将磁带插入带盒,当揿压放像键时(或快进键),放像功能(或快进功能)自动转入倒带键功能。即除了停止键外,不论按哪个功能键,都会使机子自动转入倒带功能,磁带始终处于倒带状态。检查与分析:根据此故障现象,判定原因出在用于自动倒带的一只光电二极管上。该管型号是SP-13,位于录像机盒带舱的左下侧。它的作用是:当录像带放像完毕或快进转到磁带的末端时,由于磁带末端有一段白色塑料与褐色的磁带相连(约15厘米),当磁带放完,转到白色塑料带时,它的白颜色使光电二极管感光,从而使电路处于自动导通状态,
Symptom: Turn on the recorder power switch, insert the tape into the cassette, press the play button (or fast forward button), the playback function (or fast forward function) automatically into the rewind button function. That is, in addition to stop the key, no matter which function key, will make the machine automatically into the rewind function, the tape is always in the rewind state. Inspection and Analysis: According to this fault phenomenon, the reason for the judgment is for a photodiode for automatic rewinding. The tube model is the SP-13, located on the lower left of the cassette deck. Its role is: when the tape is played or fast-forward to the end of the tape, the end of the tape has a white plastic and brown tape connected (about 15 cm), when the tape is discharged, go to the white plastic band, Its white color makes the photodiode photosensitive, so that the circuit is in an automatic conduction state,