Re: HP8753C Source Pretune after YIG replacement
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It is hard to guess a person's?level of expertise but since you can measure?the 3.8GHz I think you know what you are doing. How and where are you measuring?the YIG output? Have you checked ALL the self tests.?The higher level ones have to be specifically called up and are not included in the normal boot up self test. Is the analog bus working? Does the tune voltage look normal? These are a few things that can make a YIG appear dead. I will send you some repair logs privately that might help.
On Tue, Feb 1, 2022 at 05:40 PM, peter bunge wrote:
Are you sure the YIG is dead? How do you know? I suggest you don't adjust anything until you know what the problem is.
My method of troubleshooting is to go through the adjustments procedure but WITHOUT ADJUSTING ANYTHING. Anything way off indicates the?problem area. Often a failure in a closed loop.
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The voltages are OK but there is NO outut from the YIG. I see the 3.8 GHz signal (+10dbm) from the cavity oscillator but absolutely nothing from the YTO.? If it's no the YTO what else could it be?
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