检修过程:测跑台时33V电压在25V左右波动,高频头BT端不漏电,33V稳压管正常,限流电阻正常. 最后发现问题出在字符输出电路,V902基极与33V之间的线路板漏电,使其进入放大状态,电流加大,导致33V电压下跌 |
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