Hello, i failed cal on my hp3478a. But i failed it in wired way. I just touched cap510(as i remember) with iron and meter told me "uncalibrated". Ye ,ye, they both was floating, i swere. Anyway i find out that i got only 0.3v on sram chip insted vbat(3v). Somewhere voltage drops. Its hard to me trace out ram power,
so has someone scematic? I cant find it.
P.S. ive checked few diods and caps, they looks good. Hope sram is not dead.