nacgy的维修日志

nacgy

松下TC-29V30R副电源故障导致伴音失真<p class="MsoNormal" style="" 0cm="" 0pt;=""><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" times="" new="" roman="" ;="">松下</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">TC-29V30R</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" times="" new="" roman="" ;="">故障现象是</span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" times="" new="" roman="" ;="">左右声道伴音均失真，伴有撕裂声。</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">
                                <p></p></font></span></p><p class="MsoNormal" style="" 0cm="" 0pt;=""><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">该机他人曾修理过，据说是用</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">M25</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">的功放代替其功放部分时伴音正常，因而判断系功放部分的故障，但更换过功放</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">IC2301(TA8200)</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">，检查了功放外围均未排除故障，再转到本人处维修。采取脱板维修法，</span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">测量</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">V2(3)</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">脚电压为</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">0.7V</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">左右，而</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">E1</font></span><span style="font-size: 12pt; font-family: 宋体;" lang="EN-US">⑧</span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">脚（副电源</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">+8.5V</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">输出）只有</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">6.8V</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">左右，怀疑滤波不良，测</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">C885(10</font></span><span style="font-size: 12pt; font-family: 宋体;" lang="EN-US">μ</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">F/35V)</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">容量减为</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">5.8</font></span><span style="font-size: 12pt; font-family: 宋体;" lang="EN-US">μ</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">F</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">左右，用一只</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">10</font></span><span style="font-size: 12pt; font-family: 宋体;" lang="EN-US">μ</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">F/50V</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">更换之故障排除，此时实测</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">V2(3)</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">脚电压为</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">0V</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">，</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">E1</font></span><span style="font-size: 12pt; font-family: 宋体;" lang="EN-US">⑧</span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">脚（副电源</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">+8.5V</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">输出）升至</span><span style="font-size: 12pt;" lang="EN-US"><font new="" roman="" face="Times new=">8. 8V</font></span><span style="font-size: 12pt; font-family: 宋体;" mso-hansi-font-family:="" &quot;times="" new="" roman&quot;;="">左右。</span></p>
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[此贴子已经被叶师于2009-6-9 23:49:47编辑过]

zvkaya

9 Z4 y% U! E' l- }% h8 O. X" _                               
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zvkaya

                               
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liaoyaoguang

本人有同一机型，故障现象也是一样（是否光栅突然变亮撕裂声就特别严重，暗的时候没那么严重），本机都是送修后出现此现象。

liaoyaoguang

等有时间按楼主的方法修一下，在这先多谢楼主

电虾米

<p>那是小日本的商业阴谋，试问国产机有敢把滤波电容设计成<font face="Times New Roman">112</font><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt;">μ</span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt;"><font face="Times New Roman">F</font></span>的？</p><p>但是我们也应感谢他们.....</p>

cf888

<p>学习了</p>

hxw28

[em01]学习

lxclsw

<p>修过此故障，确是副电源问题，有时还引起遥控失灵，因为接收头是经一电阻接5v的，5v因滤波电容失效而变低，遥控接收头的供电电压更低，遥控便失灵了，我同时修过因<span lang="EN-US" style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt;"><font face="Times New Roman">C885(10</font></span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt;">μ</span><span lang="EN-US" style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt;"><font face="Times New Roman">F/35V)</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-ascii-font-family: 'mso-hansi-font-family:';">容量减小而引起伴音失真和遥控失控的故障，<span lang="EN-US" style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt;"><font face="Times New Roman">C885用47uf/50v</font><font face="宋体">更换后，两个故障都消失了，这说明遥控失灵不一定是接收头故障，也可能是<span lang="EN-US" style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt;"><font face="Times New Roman">C885失效引起的，遇到遥控失灵不妨先检查一下<span lang="EN-US" style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt;"><font face="Times New Roman">C885！</font></span></font></span></font></span></span></p>[em09]