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Advantest R3273 100Hz-26.5GHz Spectrum Analyzer repair
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dschiedsch:
I'm starting this topic because I have bought 2 Advantest R3273 Analyzers on ebay.
Both with different defects.
So far I have been able to replace the step attenuator and got the signal path below 3GHz working.
There was a defect bias circuit for the first mixer which put DC voltage in the first stage and degraded the signal greatly.

Since I also had to replace the mainboard all the cal data is incorrect.
This is not a problem for the range <3.5GHz because the inbuilt cal puts everything back in order.
However for frequncies above 3.5Ghz they go through a different frontend (YTF -> YIG tuned filter) and this is not calibrated with the built in cal function but has to be calibrated thorugh service menu.
Sadly I'm missing the cal manual and the password for the service menu.
I have extracted the firmware / OS which is on a CF card but so far haven't been able to find the password anywhere.
The image can be found here:
good_spectrum.img


Also I'm not sure what architecture the CPU is.
I've taken pictures.
http://imgur.com/a/gGEWs
Maybe someone on the forum is able to point me in the right direction.

Regards
PA0PBZ:
The image contains only one file: good_spectrum.exe, which has a signature indicating that it is for Intel X86 architecture. None of the text in that file points to a spectrum analyzer.
Also, what's up with all the red paint  :-//
dschiedsch:
Hi
You downloadad the wrong file. Damn upload sites  :horse:
You have to use the correct download button (see picture)
you should get a ~15Mb .img file. Which you can either mount or open with 7-zip
I would not touch the .exe probably a trojan or similar

About the red paint. I was thinking maybe quality control or something similar.
Not sure though.
Both analyzers have it.
PA0PBZ:
Oops, can't imagine I made a noob mistake like that!  :palm: It started to download automatically so I assumed it was the correct file, but trying again I could click the correct download button. Of course I did not execute it :)

Well, this is interesting. It looks like the image is FAT, at least I could extract the files that way. This is what I found so far:

* Processor is Motorola 68020, I found '68020' in the iplx.sys file and I could disassemble it as 68020 code.
* OS is a mystery, I think it's called ATOS but I've never heard of it. it's built on a bunch of .X executables like SETUP.X, STATUS.X, MENU.X and so on.
*I think I found your options:

OPT61: IS-95  [A08] Aug 08 2001
OPT62: 3GPP   [J01] Jul 21 2004
OPT65: cdma2000
              [D00] Jan 24 2003
OPT67: HDR    [E00] Jun 28 2004


I found the occurrence of the text "password" in the MAINTE.X file but nothing obvious stands out as the solution at first glance:


nctnico:
What would be interesting is loading the executables into a debugger and the see where the 'password' texts are referenced to. The could help to determine how the password is tested (and perhaps patch the software to just skip the test and accept any password).
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