Check "thesignalpath" on youtube.? Shariar did a complete teardown and repair of an HP step attenuator a few years ago.? It should give you all the guidance you need.? I did a quick search through his videos but didn't find it. I know it's there, but it might be embedded in a larger repair video of an HP sig gen or spectrum analyzer.? I'll keep looking but I know it's somewhere in his collection.
BTW, Shariar produces excellent "teardown and repair" videos plus some really good tutorials.
BRgds....Frank
