I opened the case of this unit straight out of the box (never powered up), so nothing to discharge. I then cut out the fan grill. Then, stripped off insulation on the wire to the fan and so I could measure it's voltage. THEN, powered it up so I could do some tests.
My very first test was to carefully monitor the heatsinks for voltage; black wire to case, red wire to heatsink. This normally is a very safe, precautious way to see what's 'live'. Sadly, I had the red lead of my meter hooked up as an ammeter (read: short circuit)!!! In this mode, 'anything' I measured would have blown! Can't believe I did that.
I could happily and safely touch the heatsink as long as I was not grounded; but when I put one finger on the heatsink, and another finger on the case, my whole arm lit up! (a first for me in over 30 years messing with electronics!).
But I can't understand why the heatsink would be sitting there at -160V DC. It's not the capacitor, by the way - it's a very clear reading, coming from the heatsink, repeatedly. The heatsink has only one item attached to it.
The other thing I don't understand is the voltages on the fan. I just read Mike Chin's review of the Seasonic
He talks about measuring ~5V on the fan. I measured 12V on the fan; but ... on the negative lead, I measured about 6V, thus about 6V is being applied to the fan. So was Mike simply referring to the net voltage across the fan, or was the regulation really on the + side on his model? My Zalman PSU regulates the + side, and I measure 5, 6, 7 etc Volts on the + lead; but with the Seasonic, they are choosing to regulate the - side, it seems. Doesn't matter, of course, just curious.
Mike - when you and I discussed the Zalman, we concluded that the built-in fan was actually better, at low voltage, than the Panaflo - quieter and higher airflow. You had me insert a 22 ohm resistor in the circuit, and the results were great. Have you done likewise in the Seasonic? Your review criticises the ADDA fan; would you recommend swapping the ADDA for a Panaflo, AND inserting a resistor, or just swapping fans?