I have a HP8153A that does not power up. I was not able to find any schematics or service manual for this instrument.
I made quick measurements at the power-supply board (HP P/N 08153-66503) and it seems that the input stage is okay and after the rectification I have +165V (input 110Vac). But after the switching stage, no voltage level. I cannot detect any sign of "oscillator on". I believe that the driver is a component Q101, but I am not sure.
I tried to look at eBay and found a lot of these instruments with the same problem (no power). Any hint?