与E4402B对齐问题

嗨，我们有一个E4402B，有以下选项：1DR，1DS，1D6，B72,1D5，A4H，AYX，AYQ，1DN历史：一位同事使用跟踪发生器的输出作为小功率放大器的输入
电路因为我们没有高频高频发生器。
我不确定发生了什么，但他打电话给我让我知道跟踪发生器不再工作。
他只使用TG输出而没有使用SA的输入。
我们买了一份服务手册，我刚开始经历。
打开SA，屏幕显示如下：+ System，Alignments，Align Now，Align All + Perform a + Align All +不会从显示中删除消息，也不会在错误历史记录中显示任何错误消息。
我尝试手动对齐并运行+ Align Now-> RF +，但它会显示错误消息：+ RF Required +和+ Amptd输出输出+输入+即使我连接了电缆。
我可以用另一个SA测量50MHz参考信号，所以我知道它正在工作。
什么是无效的是对准信号。
在整个校准过程中以及在服务手册中检查21.4MHz校准信号+后，我从未看到任何来自电缆W2 /输入到A3 IF组件（A3J2）的21.4MHz信号。
另一个SA仅测量高达1.8G，因此我无法验证第一个IF输出，但测量第二个IF输出，它在321.4MHz时没有显示任何内容。
那么，A8射频组件是不是很好？
这是有意义的，因为TG也不起作用。
在为新射频组件分配现金之前，有关进一步测试的建议吗？
谢谢，迈克



     以下为原文

  Hi,

We have an E4402B with the following options: 1DR, 1DS, 1D6, B72, 1D5, A4H, AYX, AYQ, 1DN

History: A co-worker used the output of the tracking generator as in input to a small low power amplifier circuit as we did not high a high frequency generator. I'm not sure what happened, but he phoned me to let me know the tracking generator was no longer working. He was only using the TG output and was not using the input to the SA.  

We bought a service manual and I have just started going through it. Turning on the SA, the screen showed the following:

+System, Alignments, Align Now, Align All+

Performing an +Align All+  doesn't remove the message from the display nor do any error messages show up in the Error History.  

I tried to align manually and running a +Align Now->RF+ but it gives the error message:

+RF Required+ and +Connect Amptd Ref Output to Input+ even though I have a cable connected.  

I can measure the 50MHz reference signal with another SA so I know that is working.  

What isn't working is the alignment signal.  Throughout the whole alignment process and following +Checking the 21.4MHz Alignment Signal+ in the service manual, I never see any 21.4MHz signal from cable W2/ input to the A3 IF assembly (A3J2).


The other SA only measures up to 1.8G so I cannot verify the 1st IF output, but measuring the 2nd IF output, it doesn't show anything at 321.4MHz.  

So, is the A8 RF assembly pooched? It would make sense since the TG isn't working either.  

Any suggestions on further tests to run before forking out the cash for a new RF assembly?  

Thanks,
Mike