| 故障表现为：伴音时有时无 分析与检修：该机声音时有时无，试机当出现无伴音时查数字板伴音部分各电压时U502电压偏高到9.1V正常时为8V，根据技改将U502换成1.8V三端稳压，取消R562，R563并在对地接一个6.2V的稳压二极管,试机伴音正常 |
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