ADVANTEST R3753 series service manual

[mrf245]

Hello,I have bought ADVANTEST R3753A network analyzer and maybe it has some issue in RF unit.I can just found operation manual and nothing about repair.If anyone has service manual or other document about reapir would like share to me,I will so appreciated.Thinks

[HalfSpace]

Hi mrf245,

I don’t think ADVANTEST have service manuals for their network analyzers, they call them maintenance manuals with have no schematics or technical descriptions only calibration and maybe an error code listing to tell you which module/PCB to replace! 

I have fixed some of their network analyzers so give us some more details of the fault I may be able to help.

HalfSpace 

[ARF]

I will update the topic.
I received such a network analyzer and planned to use it instead of my R3754A.
I don't have much experience with such devices, but it seems to me that the 3753 does not work properly.
I had to repair the display and replace the capacitors (almost all 33uF25V degraded), but this did not change the operation of the analyzer.

I turned on the analyzer, connected it with wires:
Output 2 and input R
Output 2 and input A
r3753_connection.png
I see on the screen from time to time flashing the inscription "Rch Overload"
adv1.jpg
I figured out that the problem is with the transmitter.
You can notice spikes on the waveform, which is why I see the overload message.
adv2.jpg
adv5.jpg
If I do not set the full range (5Hz-500MHz), but with 1MHz, then the problem goes away.
adv3.jpg
The problem does not appear in the low frequency range of 5 Hz - 999.999 kHz
adv4.jpg

I found out that this is a problem of switching from 999.9999KHz to 1MHz
adv6.jpg
adv7.jpg
I don't have any ideas yet.
Does anyone have such a device?