| 测整机高压供电电路C4对地电压为+305V。正常：测低压供电电路C92对地电压为+18V，正常；测C91对地电压为+5V。正常：测比较器U2各脚对地电压均正常。用R×100挡检测控制电路发现启动按钮开关S4已开路损坏，更换S4后整机恢复正常。 |
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