8562EC A14 U429B参考电压错误

可能是YTO失败的情况。
您可能想要测量YTO输出（将频谱分析仪设置为零跨度）。



     以下为原文

  It might be the case that YTO has failed. You might want to measure the YTO output (set spectrum analyzer to zero-span).

我还没有测量过YTO输出。
但是，我有点验证了LODA的输出是否存在。
我所做的是连接一个680k电阻，介于-10V和U429B的引脚5之间。
这使引脚5到-0.14v。
引脚6也被测量为-0.14v，这是LODA的峰值检测器输出。
因此，如果观察到上述情况，YTO和LODA应该正常工作。
它似乎是一个失败的DAC或沿着这条路径的东西是有问题的。
您的意见将不胜感激。
谢谢！



     以下为原文

  I haven't measured the YTO output yet. However, I sort of verified the output of the LODA is present.  What I did was connecting a 680k resistor between -10v to pin 5 of U429B. This brought pin 5 to -0.14v. Pin 6 was measured to be -0.14v as well and this is the peak detector output of LODA. Therefore, YTO and LODA should be working if above observed. 

It seems that it is either a fail DAC or something along that path is problematic. 

Your input will be appreciated. 

Thanks!

似乎LO幅度感测段是有问题的。
您是否有完整的原理图/服务文档？



     以下为原文

  It seems that the LO amplitude sensing segment is problematic. Do you have the complete schematic/service documentation available?

我只有服务指南，我无法在网上找到原理图。
如果你有一个，如果你可以与我分享，那将是很棒的。
我还测量了600MHz的参考值，它看起来是正确的。



     以下为原文

  I only have the service guide and I can't find the schematic anywhere online. If you have one, it would be great if you can share with me. 

I also measured the 600MHz ref and it looks right.

我在这个论坛上找到了A14板的原理图。
我仍然建议您使用其他频谱分析仪监控YTO输出，以查看是否存在间歇性问题。



     以下为原文

  I found a schematic of A14 board on this forum. I would still recommend you to monitor the YTO output with another spectrum analyzer, to see if intermittent problem exists.

附件

• 08564-60014.pdf4.0 MB
  

感谢分享。
这个CLIP似乎是8564 A14。
它与8562EC有点不同。
但无论如何，谢谢。
我打算在下周测量YTO。
是否更容易在LODA LO IN中移除SMA进行测量？



     以下为原文

  Thanks for sharing.  This CLIP seems to be the 8564 A14.  It's kinda different from 8562EC.  But thanks anyways.  I am going to measure the YTO next week.  Is it easier to remove the SMA at LODA LO IN for the measurement?

原理图与我的8563E中的A14板不完全匹配，但它在研究电路拓扑方面很有帮助。
是的，这就是我测量YTO输出的方法。
不要忘记将A14板上的跳线设置为“TEST”位置以打开YTO PLL。
祝你好运！



     以下为原文

  The schematic doesn't exactly match the A14 board in my 8563E either, but it is helpful in terms of studying the circuit topology. Yes, that's what I did to measure the YTO output. Don't forget to set the jumper on A14 board to "TEST" position to open the YTO PLL. Good luck!

嗨PA0ALV，是的，它看起来完全一样！
谢谢！



     以下为原文

  Hi PA0ALV,

Yes, it looks exactly the same!

Thanks!

嗨Marc1我确实遇到过同样的问题。
检查两个二极管VR1和VR5。
VR5有棕色的色调（过热）。
拆焊二极管，正常值正常但对面方式为奇数。
可能是解决方案。
gl Ary编辑：PA0ALV于2015年3月30日上午2:36



     以下为原文

  Hi Marc1

I do have once the same problems.
Check the both diodes VR1 and VR5. VR5 have a brown shade of colour (overheathed). 
Unsolder the diode, forward  normal value but the oposite way an odd one.
May be it's the solution.
gl
Ary

Edited by: PA0ALV on Mar 30, 2015 2:36 AM

非常感谢，PA0ALV。
我将看看这些二极管。
那么，如果反向测量异常，VR5不调节电压，对吗？
它们似乎位于主线圈驱动电路中。
刺猬，谢谢你的提示。
我今天对YTO输出进行了一些测量（测试位置上的跳线），并且在那里没有发现输出信号。



     以下为原文

  Thanks a lot, PA0ALV.  I will take a look of these diodes.  So, VR5 is not regulating the voltage if reverse measured abnormal, correct?  They seem to be in the main coil drive circuits.

hedgehog, thanks for the tips as well.  I did some measurement on YTO output today (jumper on test position), and found no output signal there.

您是否将量程设置为零以将LO信号“停放”在特定频率？
可以从“校准”菜单获取实际LO频率。



     以下为原文

  Did you set the span to zero to "park" the LO signal at a certain frequency? The actual LO frequency can be acquired from "Cal" menu.

是的，我设置零跨度并检查中心频率为0Hz和300Mhz等。没有来自YTO的输出。
我想知道主线圈驱动器是否失效也会导致YTO没有输出。
我不确定，我现在正在研究电路。



     以下为原文

  Yes, I set zero span and checked center frequency at 0Hz and 300Mhz and etc.  No output from YTO. 
I was wondering if main coil drive fail will also lead to no output at YTO.  I am not sure and I am studying the circuits now.

是。
如果没有主线圈中的调谐电流，YTO将不会产生RF输出。
然而，通过测量馈入邮件线圈的电流，可以相当容易地识别该问题。



     以下为原文

  Yes. Without the tuning current in the main coil, YTO will not generate RF output. However, this issue can fairly easy to identify by measuring the current fed into the mail coil.

谢谢大家的信息。
主线圈+和主线圈之间的电压 - 大部分频率为+3.5，零跨度。
这是一个合理的阅读吗？
我没有焊接两个齐纳二极管，5V和10V并验证它们是好的。
任何建议，将不胜感激。
谢谢！



     以下为原文

  Thanks all for the information. 

The voltage between main coil + and main coil - is +3.5 for most of the frequency with zero span.  Is that a reasonable reading?

I un-soldered the two zener diode, 5V and 10V and verified they are good.

Any suggestions would be appreciated.

Thanks!

流入邮件线圈的电流与输出频率成线性比例。
由于我不知道这个特定YTO的调谐灵敏度或主线圈电阻，我不知道你测量的电压是否有意义。
但是，如果改变中心频率（在同一频段内），电压应该会改变，因为DC的邮件线圈相当于一个电阻器。



     以下为原文

  The current into the mail coil is linearly proportional to output frequency. Since I don't know the tuning sensitivity or main coil resistance of this particular YTO, I can't tell if the voltage you measured makes sense. However, the voltage should change if you vary the center frequency (within the same band), as the mail coil at DC is equivalent to a resistor.

嗨Marc1，sri fo延迟回应。
另一种可能性是在CW模式下使用扫描或射频发生器。
！
这是很多工作！
断开spa的YTO输出刚性电缆。
（您必须取出YTO）将扫描或射频发生器连接到刚性电缆。
将300 MHz“校准信号”连接到spa输入连接器。
设置分析仪频段“0”Freq 300 MHZ，中心频率300Mhz。
“零跨度”设置生成器应用程序。
至3,62 GHz +10 dBm（或计算频率）并小心地前后调谐，并在线路上升时查看crt。
没有扫描动作所以很难看到一些东西。
在调谐期间有一些运动时，确定原始YTO发生故障。
主线圈和外围线圈永远不会出现缺陷，其“仅”是振荡器晶体管。
测量主线圈电流，必须通过转动RPG来改变。
如果是这样且YTO没有输出，2e结论YTO缺陷。
如果主线圈电流没有变化，驱动器或电路不正常Ary pa0alv



     以下为原文

  Hi Marc1,

sri fo the delayed response.

An other possibilty is by using a sweep- or rf generator in CW mode. !
It is a lot of work! Disconnect the spa's YTO output rigid cable. (You have to take out the YTO)
Connect the sweep- or rf generator to the rigid cable.
Connect the 300 MHz "Cal signal" to the spa input connector. 
Set analyser band "0" Freq 300 MHZ, center freq 300Mhz. "zero span"
Set generator appr. to 3,62 GHz +10 dBm (or calculate the frequency) and tune carefully back and forward
and look at the crt when the line goes up. 

There's no sweep action so it can be difficult to see something.
When there is some movement during tuning it is sure the original YTO is malfunction.

The main- and fm coil are never defect, its "only" the oscillator transistor.
Measuring main coil current, it must change by turning the RPG. If so and no output from YTO, 2e conclusion YTO defect.
If main coil current did not change, driver or circuit not ok

Ary
pa0alv

嗨Marc1，sri fo延迟回应。
另一种可能性是在CW模式下使用扫描或射频发生器。
！
这是很多工作！
断开spa的YTO输出刚性电缆。
（您必须取出YTO）将扫描或射频发生器连接到刚性电缆。
将300 MHz“校准信号”连接到spa输入连接器。
设置分析仪频段“0”Freq 300 MHZ，中心频率300Mhz。
“零跨度”设置生成器应用程序。
至3,62 GHz +10 dBm（或计算频率）并小心地前后调谐，并在线路上升时查看crt。
没有扫描动作所以很难看到一些东西。
在调谐期间有一些运动时，确定原始YTO发生故障。
主线圈和外围线圈永远不会出现缺陷，其“仅”是振荡器晶体管。
测量主线圈电流，必须通过转动RPG来改变。
如果是这样且YTO没有输出，2e结论YTO缺陷。
如果主线圈电流没有变化，驱动器或电路不正常Ary pa0alv



     以下为原文

  Hi Marc1,

sri fo the delayed response.

An other possibilty is by using a sweep- or rf generator in CW mode. !
It is a lot of work! Disconnect the spa's YTO output rigid cable. (You have to take out the YTO)
Connect the sweep- or rf generator to the rigid cable.
Connect the 300 MHz "Cal signal" to the spa input connector. 
Set analyser band "0" Freq 300 MHZ, center freq 300Mhz. "zero span"
Set generator appr. to 3,62 GHz +10 dBm (or calculate the frequency) and tune carefully back and forward
and look at the crt when the line goes up. 

There's no sweep action so it can be difficult to see something.
When there is some movement during tuning it is sure the original YTO is malfunction.

The main- and fm coil are never defect, its "only" the oscillator transistor.
Measuring main coil current, it must change by turning the RPG. If so and no output from YTO, 2e conclusion YTO defect.
If main coil current did not change, driver or circuit not ok

Ary
pa0alv

亲爱的PA0ALV，
请写信给我发送邮件minolta1 at cninet point cz我需要你的帮助8591A。
谢谢！



     以下为原文

  Dear PA0ALV  ,
write me please to email minolta1 at cninet point cz  I need your help about 8591A . Thanks!