As for C2 it is a Nichicon 10,000 uF 50WV (what is WV?) 105 degree cap. I tried to measure it but I assume it is out of the range of my DMM. It jumps up to around 9300 uF and then shows 0L on the screen.
I thought the 1000uF in the service manual had to be a misprint. 10,000uF means the main cap can take minutes to get close to a full discharge, so to eliminate output glitches, the op-amps have to keep working till the +12v is discharged.
Now I think I made a mistake in assuming that of course HP had carefully designed this power supply so it shut down perfectly - especially as they had no output switch. I could almost bet my house on it.
Well, luckily I didn't, or I would be on the streets by now.
Here are the service notes:
http://litstation.marketing.agilent.com/litapp/SearchSN.do?method=openExternalSNSearch&prodNum=e3610aThere initially was an overshoot condition on power down when both the +/-12 supply capacitors were 330uF. So they increased the -12V one to 470uF.
The scary bit in the service note is this:
If the readings increase after the power supply is switched “off” by more than 5%
then the power supply has “excess turn-off overshoot”.
So 5% overshoot on turn off is fine!
Is this really HP? I just find it hard to believe!
So if your supply is fully working (voltage works over the full range, current limit works, output clean and all the other 4 service notes have been looked at), it is possible that HP's bodgy fix of C13 is not goon enough. It is not just that they have the overshoot, but when you turn a supply off, you want it to immediately turn off. Not sometime in the distant future -- which is the way it works now.
My suggestion is to replace C13 with 1000uF 50V and see if that cures the overshoot problem.
Also if it was me, I would drill a hole in the front panel and add a toggle switch so I could switch the load on and off. Then you will have a MUCH better power supply.
Until you do that, the safe way to use this power supply is to unplug the load before switching off.
Other then the switch off fiasco, it is a great supply.
Richard