Thanks for the info. Any schematics of the modification? Marc
> On Aug 13, 2016, at 2:37 AM, Rik Bos <hp-...@xs4all.nl> wrote: > > > For what it's worth a small warning about the HP 9825 series computers. > The power supply doesn't have a crowbar(over voltage protection), so a > transistor failure in the Psu can be catastrophic. > On the other hand the two 9835's I have, which uses the same form factor and > almost the same power supply layout are HP modified with crowbars added. > It seems to be good practice to add some ov-protection to the HP 9825 supply > because the switching transistor and 723 voltage regulators don't have the > eternal life. > And there no certain prediction in how they fail, short or open circuit, I > found out the hard way several years ago. > > -Rik >