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Advantest R3273 100Hz-26.5GHz Spectrum Analyzer repair

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hafrse:

--- Quote from: dschiedsch on August 26, 2016, 12:30:44 pm ---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

--- End quote ---

Hello,

I think the  image file you posted is removed from the link you have, can you please check ? I am curious to check the files there.
Thanks

Regards

PA0PBZ:

--- Quote from: hafrse on February 26, 2017, 09:49:24 pm ---I think the  image file you posted is removed from the link you have, can you please check ? I am curious to check the files there.

--- End quote ---

Uploaded here: http://www.filedropper.com/goodspectrum

hafrse:

--- Quote from: PA0PBZ on February 26, 2017, 10:00:35 pm ---
--- Quote from: hafrse on February 26, 2017, 09:49:24 pm ---I think the  image file you posted is removed from the link you have, can you please check ? I am curious to check the files there.

--- End quote ---

Uploaded here: http://www.filedropper.com/goodspectrum

--- End quote ---
Thanks

dschiedsch:
Hi.
No I haven't found someone with a signal source yet.
I'm talking to someone at the university which looks good but I don't have that much time at the moment so it will take another month or so to do it.
Since someone else reuploaded the image I didn't reupload my copy. I hope thats ok. Otherwise I can upload mine as well

hafrse:
You are right, no way to save calibration values , write protection is on and can not be changed....

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