[cctalk] Re: Identifying a Failed Diode in a Rainbow H7842 Power Supply

On Nov 23, 2022, at 1:00 PM, Don R <organlists1(a)sonic.net> wrote: NTE seems to turn up these possibilities for a H9501. https://www.nteinc.com/search/search/search.php?ss360Query=H5901 Don Resor Sent from someone's iPhone >> On Nov 23, 2022, at 12:04 PM, Antonio Carlini via cctalk <cctalk(a)classiccmp.org> wrote: >> > On 21/11/2022 21:45, Antonio Carlini wrote: >> >> I have two more I can open up and look at, but I cannot get to them tonight and I'm probably out tomorrow too. But I think I can get to those other two supplies on Wednesday. Hopefully at least one of them will be readable! Otherwise I can desolder the diode from one of the other two and hopefully find a useful marking. > > > Turns out I have three more PSUs ... and the diode markings are unfortunately invisible on all but one. That one is this one: > > https://drive.google.com/file/d/1TeGTcBBv7KecMJ2CmNcR0O-tb3jZigy6/view?usp=… > > > It's not really visible there either but with the PSU out and one end desoldered I can see that it is marked H9501. I can also see that it doesn't conduct either way, which might mean that this PSU is the non-working one I know I have. Obviously the capacitor (820uF 250V electrolytic) is going to need replacing (might as well do both). But first I need to remove them and see what (if anything has happened) underneath. > > > This now goes back into my queue (behind the MicroVAXes and the H7868B PSU modules) so if you fix yours before I get to mine, please let me know what you did :-) > > > Antonio > > > -- > Antonio Carlini > antonio(a)acarlini.com >