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Issue with Overloaded Test Port

Question asked by chiweng on Jul 14, 2011
Hi,

I have been using HP8720C Network Analyzer. Recently, it is not functional because of the error messages "Test Port Overload, Reduce Power" and "Phase Lock Cal Fail". I suspect that too much input power to the test port has damaged something internal. At one point, I was able to get it working again by pressing the User Preset button; unfortunately, the error reappeared again and it stays non-operational.

I am not sure if this is the right place to ask the question since I know that the model is no longer supported. I just want to see what my option of repair would be. Also, is there any master reset routine I can perform to revive the situation without a costly repair.

Any suggestion would be greatly appreciated.

Thanks,  

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