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该机在接通电源后,无论在放音或收音状态均无声,但用镊子碰触一下前置放大器7IC_1(TA7668AP)的⑥、⑦脚或⑩、(11)任一脚均能使收音和放音恢复正常,这时如果断开电源后再插上,开机后又会出现上述故障。该机功放电源直接由机芯开关K_6、K_7和功能开关K_(2～6)控制,即只要按下放音键或将功能开关接通收音位置,功放电路即处于工作状态。故障时用镊子碰触功放输入①、⑥脚,扬声器发出“嘟嘟”声,再碰触音调控制级2BG_1、2BG_2也正常,说明故障时功放及音调级无异常,但都不能使收音及放音恢复正常。而当碰触前置放
The machine in the power, no matter in the playback or radio state are silent, but touch the preamplifier 7IC_1 (TA7668AP) ⑥, ⑦ foot or ⑩, (11) of any one foot can make the radio and Playback back to normal, then disconnect the power and then plug in, boot again after the above failure. The machine power amplifier power supply directly by the movement switch K_6, K_7 and function switch K_ (2 ~ 6) control, that is, as long as the press the play button or the function switch is turned on the radio position, the power amplifier circuit is in working condition. Fault with tweezers touch the amplifier input ①, ⑥ feet, the speaker beep “beeps”, then touch the tone control level 2BG_1,2BG_2 also normal, indicating the failure of the amplifier and tone level without exception, but can not make the radio and put Sound returned to normal. And when touched before the release