| 故障表现为：音量自动减 分析与检修：开机测KEY1电压为2.3V，正常应为3.3V.很明显不正常。此板过孔问题居多，仔细检查发现R281到KEY1之间的过孔不通，飞线连接故障机修到这里，终于修好值得探讨。。 |
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