我只是成功修复了我的8751A并且现在工作正常。我检查了主PSU，这个型号和原理图非常类似于HP8753A / B模块，但是8751还有一个输出线。这没问题。接下来我发现了post reg（08751-66540）
），大部分输出LED在上电后闪烁一次但没有连续输出，我考虑了一些保护信号导致它。我仔细检查了这块PCB并将其与HP8753A / B原理图后的比较，发现它们有一些共同的设计方法，但是
有些是真的不同。所以我试图找到哪个信号导致保护。我终于发现其中一个从机器后面的FAN出来，黄线，如果这条线上升到5V，这意味着FAN没有工作。这次FAN真的没有
我和FAN电源线一起检查了一下，发现寄存器板上有一个熔断器（1A）烧坏了。我用一个保险丝替换它，重新上电，它工作正常并做了非常尖锐的测试。
我非常感谢keyight库Le，他帮我找到了库书库上的8751服务手册，即使没有扫描文件。
我希望这种修复可以帮助那些需要帮助的人。
以上来自于谷歌翻译
以下为原文
I just success repaired my 8751A and it worked fine now.I have checked main PSU,this model and schematic extremely similar to HP8753A/B module but 8751 with one more output line.It's no problem.Next I found post reg(08751-66540),most of output LED flashed once after power-on but no continuous output,I considered some protect signal cause it.I checked this PCB carefully and compare it with HP8753A/B schematic post reg,found they have some common design method,but some are really different.So I tried to find which signal cause protection.I finally found one of them come out from FAN behind mechine, yellow line,if this line rise up to 5V,it means FAN no working.This time FAN really no working.I checked along with FAN power line,and found a fuse resister(1A) on post reg board was burned.I used a fuse to replace it,repower-on,and it worked fine and made very sharp test.
I really appreciated keysight library Le,he helped me find 8751 service manual on library bookbox,even if no scanfiles.
I hope this repair can help people who need help like this.
我只是成功修复了我的8751A并且现在工作正常。我检查了主PSU，这个型号和原理图非常类似于HP8753A / B模块，但是8751还有一个输出线。这没问题。接下来我发现了post reg（08751-66540）
），大部分输出LED在上电后闪烁一次但没有连续输出，我考虑了一些保护信号导致它。我仔细检查了这块PCB并将其与HP8753A / B原理图后的比较，发现它们有一些共同的设计方法，但是
有些是真的不同。所以我试图找到哪个信号导致保护。我终于发现其中一个从机器后面的FAN出来，黄线，如果这条线上升到5V，这意味着FAN没有工作。这次FAN真的没有
我和FAN电源线一起检查了一下，发现寄存器板上有一个熔断器（1A）烧坏了。我用一个保险丝替换它，重新上电，它工作正常并做了非常尖锐的测试。
我非常感谢keyight库Le，他帮我找到了库书库上的8751服务手册，即使没有扫描文件。
我希望这种修复可以帮助那些需要帮助的人。
以上来自于谷歌翻译
以下为原文
I just success repaired my 8751A and it worked fine now.I have checked main PSU,this model and schematic extremely similar to HP8753A/B module but 8751 with one more output line.It's no problem.Next I found post reg(08751-66540),most of output LED flashed once after power-on but no continuous output,I considered some protect signal cause it.I checked this PCB carefully and compare it with HP8753A/B schematic post reg,found they have some common design method,but some are really different.So I tried to find which signal cause protection.I finally found one of them come out from FAN behind mechine, yellow line,if this line rise up to 5V,it means FAN no working.This time FAN really no working.I checked along with FAN power line,and found a fuse resister(1A) on post reg board was burned.I used a fuse to replace it,repower-on,and it worked fine and made very sharp test.
I really appreciated keysight library Le,he helped me find 8751 service manual on library bookbox,even if no scanfiles.
I hope this repair can help people who need help like this.
举报
