上门修一台松下panasonicTC-1873，指示灯长亮，扬声器无噪音，机主反映年轻维修师傅更换过场块，无进展被机主请出去。测7812两端都没电压，更换+15V整流限流电阻和保护稳压管后一切正常了. |
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