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Advantest R3132 help request

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Gianni:
I got for free an Advantest R3132 with TG.
It "seems" to work but really doesn't:
- almost every menu or key is apparently working
- the initial self test says all OK
- the calibrator out is OK (precise and stable)
- the TG seems to work
- the trace seems OK but is exactly 20MHz and 5dBm shifted. Using offsets it "appears" to be correct
- the trace is however very "noisy", especially if I reduce the bandwidth
- the manual self test (SHIFT/1) says that CPU and RF are KO. I can believe that RF is not OK, but it's hard to think that the CPU is KO.

I could not find any service manual or schematic. Could someone kindly help me? Thanks in advance

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