Advantest R3132 Spectrum Analyzer ---- RF fail ----

[Freddy2021]

Hello people,

I'm new here.
I hope I can get help here.
I have a problem with my ADVANTEST R3132 Spectrum Analyzer (no options),
I bought the device used.
The device worked perfectly so far, except for the error when booting BACK UP RAM == NG
Not OK. and CPU fail (self-test), everything else was fine so far.

Today I replaced the BACK UP battery and now BACK UP RAM is O.K. and during the self-test
(Shift 0) CPU O.K. but the device now shows "RF fail" during the self-test.

Does anyone know what could be defective?

Please help

Thank you in advance

Freddy2021

[Grandchuck]

Does it have a self-calibration function?  If so, have you tried it?

[Freddy2021]

Yes it does, the problem seems to be thermal.
If the device is cold, everything works, Cal O.K, Self-test O.K
As soon as the device is warm, the - RF Fail-  error occurs during the self-test.
Problem is the RF module
Circuit diagram ?

[nctnico]

Did you already search the forum? I think there are other threads about this problem for the R3132

[Freddy2021]

Yes, thank you .

I found it in the forum, there a similar problem is discussed

Is it also a temperature problem? Could be?