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日立 da-p100 dc-dc电源盒故障

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Post time: 2020-04-19 02:32:13 From the mobile phone
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顾老师 日立da-p100砖头CD机dcdc第六脚power开机无电压图纸写的3.48v,拿来下发下一个标号25的管子坏了,因为没有图纸,所以咨询顾考试这个标25的管子可以那些型号的管子代替感觉好像是npn型的管子

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 Author| Post time: 2020-04-19 04:16:35 From the mobile phone
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补偿一个照片

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 Author| Post time: 2020-04-19 09:04:53 From the mobile phone
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还有个问题就是这个机器发声后耳机口内有刷刷好像主轴电机那种声音,不大但是可以听到,不过按暂停碟子转但是噪音没有了是暂停时候静音电路工作了么?这个问题是dsp问题吗?它dap是cx20035yc
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 Author| Post time: 2020-04-20 18:24:15 From the mobile phone
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line out 没有这个噪音,就是耳机口小音量下可以明显感受到这个噪音,耳机口电路我看有使用电容隔离直流,但是依旧有噪音,那种噪音就是激光头那种读盘时候特有的感觉
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 Author| Post time: 2020-04-22 01:34:03
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顾老师 确认过DC-DC电路上 标25的确实坏了 是不是 DTC124EE? 另外就是噪音问题了,我看图纸linout与耳房都是来自5532 脚7 但是耳房这里音量关到最小就可以明显感受到那种噪音,音量大一些会把那个噪音掩盖了 line out 因为一直有音乐 好像是听不到这个噪音 换过这个小的耳房版依旧
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Post time: 2020-04-22 12:48:56
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For the transistor, you can replace it by S8050. Link: https://www.mouser.com/ProductDe ... AhynwOX7ajKVLUaU%3D

FOr the noise, you'll check the ground wiring of the earphone amplifier, or increase the power de-coupling capacitor to handle. When you hit "PAUSE", the mute circuit will cut everything including noise, so you're right.
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