曾经碰到以下两种情况,求高手指点:
1.UC3844供电端电压,不焊上3844供电22V,焊上后电压2V多
2.UC3844供电端7脚电压16V,8脚电压5V,4脚电压2V,1,2脚无电压,6脚无输出
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